What’s the unit rate of 144 pages in 3 minutes ?

Answers

Answer 1
To find the unit rate, divide the total number of pages by the total amount of time:

Unit rate = Total number of pages / Total amount of time

In this case, the total number of pages is 144 and the total amount of time is 3 minutes:

Unit rate = 144 pages / 3 minutes

Simplifying this expression:

Unit rate = 48 pages per minute

Therefore, the unit rate of 144 pages in 3 minutes is 48 pages per minute.

Related Questions

Ratio of men, women and children is 5:9:10
There are 480 more women than men,
how many:
(a) men,
(b) women,
(c) children are there?

Answers

The proportion is solved and the number of men , women and children are 600 men, 1080 women, and 1200 children respectively

Given data ,

Let the proportion be represented as A

Now , the value of A is

Ratio of men : women : children = 5 : 9 : 10

And , Men:Women:Children = 5x : 9x : 10x

It is also given that there are 480 more women than men.

Since the ratio of men to women is 5:9, we can set up the equation:

9x - 5x = 480

Simplifying, we get:

4x = 480

Dividing both sides by 4, we get:

x = 120

Now we can substitute the value of x back into the ratio to find the actual number of men, women, and children.

(a) Men = 5x = 5 x 120 = 600

(b) Women = 9x = 9 x 120 = 1080

(c) Children = 10x = 10 x 120 = 1200

Hence , there are 600 men, 1080 women, and 1200 children

To learn more about proportion click :

https://brainly.com/question/7096655

#SPJ1

Find the value of y in parallelogram TUVW.

Answers

The value of y in the parallelogram is 37

What is a parallelogram?

A parallelogram is a quadrilateral with two pairs of parallel sides.These are some of properties of a parallelogram.

1. The opposite sides of a parallelogram are equal in length,

2. The opposite angles are equal in measure.

3. The sum of adjascent angles is 180°

This means that;

4y - 42+ 2y = 180°

collecting like terms

4y +2y = 180+42

6y = 222

divide both sides by 6

y = 222/6

y = 37

therefore the value of y Is 37

learn more about parallelogram from

https://brainly.com/question/970600

#SPJ1

in a study about vitamins, researchers found that most adults take a daily multivitamin. specifically, the study found that 7 out of 12 adults (or 58% of adults) take a multivitamin. a medical adviser is interested in studying this topic further. he would like to test the claim that the proportion of adults who take a daily multivitamin is more than 0.58 (the proportion from the previous study). he sets up the hypotheses as: null hypothesis: p

Answers

He would fail to reject the null hypothesis and conclude that there is not enough evidence to support the claim.

What is null hypothesis?

The null hypothesis is:

H0: p <= 0.58

The alternative hypothesis is:

Ha: p > 0.58

Where p represents the true proportion of adults who take a daily multivitamin.

The medical adviser could conduct a hypothesis test using a significance level (alpha) of 0.05. He would need to collect a sample of adults and determine the proportion who take a daily multivitamin. He could then calculate the test statistic, which in this case would be a one-sample z-test, using the following formula:

z = (p - p0) / sqrt(p0(1 - p0) / n)

Where p is the sample proportion, p0 is the hypothesized proportion under the null hypothesis, and n is the sample size.

If the test statistic falls in the rejection region (i.e. if the p-value is less than the significance level), the medical adviser would reject the null hypothesis and conclude that there is evidence to support the claim that the proportion of adults who take a daily multivitamin is more than 0.58. If the test statistic does not fall in the rejection region, he would fail to reject the null hypothesis and conclude that there is not enough evidence to support the claim.

Learn more about hypothesis

brainly.com/question/29519577

#SPJ11

Based on the number of doctors at the hospital who obtained results as extreme or more extreme than the results from the study,  since 13 out of 20 samples have more than 7 adults who take a daily multivitamin, there is NOT evidence to suggest that the proportion of adults who take a multivitamin is more than 58%. the correct answer is b.

To determine whether there is evidence to suggest that more than 58% of adults take a daily multivitamin, we need to analyze the results from the 20 samples taken by the doctors.

The statement mentions that 13 out of the 20 samples have more than 7 adults who take a daily multivitamin. This means that in these 13 samples, the proportion of adults taking a multivitamin is higher than 7/12, which is equivalent to 58%.

To determine whether this difference is statistically significant, we typically perform a hypothesis test. The null hypothesis (H0) in this case is that the proportion of adults taking a multivitamin is 58% or less (p ≤ 0.58). The alternative hypothesis (Ha) is that the proportion is more than 58% (p > 0.58).

If the observed results are significantly different from what would be expected under the null hypothesis, we reject the null hypothesis and conclude that there is evidence to support the alternative hypothesis.

Since 13 out of 20 samples have more than 7 adults who take a daily multivitamin, there is NOT evidence to suggest that the proportion of adults who take a multivitamin is more than 58% because it acknowledges that the observed results are not significantly different from the original study. The correct answer is B.

In hypothesis testing, we typically set a significance level (e.g., 0.05) to determine if the evidence is statistically significant. If the p-value (the probability of obtaining results as extreme or more extreme than the observed results) is less than the significance level, we reject the null hypothesis.

Your question is incomplete but probably your full question was attached below

Learn more about hypothesis at https://brainly.com/question/17211935

#SPJ11

Find the indicated probability using the standard normal distribution.​P(z>−2.75​)

Answers

The probability P(z > -2.75) using the standard normal distribution is approximately 0.9970.

To find the indicated probability using the standard normal distribution, we need to use a z-table.

The standard normal distribution has a mean of 0 and a standard deviation of 1. The z-score represents the number of standard deviations away from the mean.

To find P(z>-2.75), we need to find the area under the standard normal distribution curve to the right of -2.75.

Using a z-table, we can find that the area to the right of -2.75 is 0.9970.

Therefore, P(z>-2.75) = 0.9970 or approximately 0.997.

This means that there is a 99.7% probability that a randomly selected value from the standard normal distribution will be greater than -2.75 standard deviations from the mean.


To find the indicated probability P(z > -2.75) using the standard normal distribution, follow these steps:

1. Identify the z-score: In this case, the z-score is -2.75.

2. Use the standard normal distribution table or a calculator with a built-in z-table function to find the area to the left of the z-score.

3. Since we need to find the probability P(z > -2.75), we'll subtract the area to the left of the z-score from 1 (the total probability).

Step-by-step calculation:

1. z-score = -2.75

2. Look up the area to the left of the z-score in the standard normal distribution table or using a calculator. For z = -2.75, the area to the left is approximately 0.0030.

3. To find the probability P(z > -2.75), subtract the area to the left from 1:

  P(z > -2.75) = 1 - 0.0030 = 0.9970

So, the probability P(z > -2.75) using the standard normal distribution is approximately 0.9970.

Learn more about probability at: brainly.com/question/30034780

#SPJ11

Identify which transformation or sequence of transformations identified below will map triangle ABC onto triangle DEF.

Answers

A Single transformation maps triangle ABC onto triangle DEF.

Given  that Reflection the single  transformation maps ABC onto A'B'C' is reflection .

The rigid transformations can map triangle Δ ABC onto triangle Δ DEF is reflection then translation .

The rigid transformations that will map Δ ABC to Δ DEF is rotation then translation .

However pair of triangles can be proven congruent by the HL theorem is rotation then translation .

Thus, rigid transformation S can map Triangle ABC onto Triangle DEF is reflection then rotation .

Learn more about the triangle here:

brainly.com/question/2773823

#SPJ1

A researcher is interested in exploring the way that nutrition and psychological health can influence fitness as measured by a physical assessment battery. The dataset of physical fitness scores appears as follows: (12 pts) (10, 13, 17, 21, 23, 27, 27, 29, 36, 40) Create a relative frequency table of raw score values using class intervals with a width of 5. Be sure to include columns for raw scores, frequency, cumulative frequency, & cumulative percentage. (4 pts) tl From your frequency table, draw a relative frequency histogram and identify the shape of the distribution. Be sure to label all axes and provide a title. (2 pts) What value corresponds to the percentile rank of 30%? What is the approximate percentile rank of X = 36? (2 pts - Hint: Use the table that you made)

Answers

The value corresponding to the percentile rank of 30% is found in the 10-14 class interval, as its cumulative percentage is 30%. The approximate percentile rank of X = 36 is 90%, as the cumulative percentage for the class interval of 35-39 is 90%.

To create a relative frequency table of raw score values, we first need to create class intervals with a width of 5. The class intervals are: 5-9, 10-14, 15-19, 20-24, 25-29, 30-34, and 35-39.

| Raw Scores | Frequency | Cumulative Frequency | Cumulative Percentage |
|------------|-----------|----------------------|-----------------------|
| 5-9        | 0         | 0                    | 0%                    |
| 10-14      | 2         | 2                    | 20%                   |
| 15-19      | 1         | 3                    | 30%                   |
| 20-24      | 1         | 4                    | 40%                   |
| 25-29      | 3         | 7                    | 70%                   |
| 30-34      | 1         | 8                    | 80%                   |
| 35-39      | 1         | 9                    | 90%                   |

To draw a relative frequency histogram, we plot the class intervals on the x-axis and the relative frequencies on the y-axis. The shape of the distribution appears to be positively skewed.

The value corresponding to the percentile rank of 30% can be found by looking at the cumulative percentage column in the frequency table. The cumulative percentage at the end of the 2nd class interval is 20%, so the value corresponding to the 30th percentile is somewhere between 10 and 14. Using linear interpolation, we can estimate that the value corresponding to the 30th percentile is approximately 11.6.

To find the approximate percentile rank of X = 36, we can look at the raw scores column in the frequency table and find the class interval that contains 36, which is 35-39. The cumulative frequency at the end of this interval is 9, and the total number of scores is 10. Therefore, the percentile rank of X = 36 is approximately 90%.
To create a relative frequency table of raw score values using class intervals with a width of 5, we can categorize the data as follows:

Class Intervals (Raw Scores): 10-14, 15-19, 20-24, 25-29, 30-34, 35-39, 40-44

Frequency: 2, 1, 2, 3, 0, 1, 1

Cumulative Frequency: 2, 3, 5, 8, 8, 9, 10

Cumulative Percentage: 20%, 30%, 50%, 80%, 80%, 90%, 100%

Next, draw a relative frequency histogram with the class intervals on the x-axis and the frequency on the y-axis. The shape of the distribution is positively skewed, as most data points are on the lower end of the scale, with a few points in the higher range.

The value corresponding to the percentile rank of 30% is found in the 10-14 class interval, as its cumulative percentage is 30%.

The approximate percentile rank of X = 36 is 90%, as the cumulative percentage for the class interval of 35-39 is 90%.

Learn more about histogram at: brainly.com/question/30664111

#SPJ11

if a binomial experiment has seven trials in which the probability of success is p and the probability of failure is q, write an expression that could be used to compute each of the following probabilities: a) p(exactly five successes) b) p(at least five successes) c) p(at most five successes)?

Answers

To calculate the probability of getting at most five successes, we can add up the probabilities of getting 0, 1, 2, 3, 4, or 5 successes

Sure, here are the expressions that can be used to compute each of the probabilities:

a) p(exactly five successes) = (7 choose 5) * p^5 * q^2
This expression uses the binomial coefficient (7 choose 5), which represents the number of ways to choose 5 successes out of 7 trials. We then multiply this by the probability of getting 5 successes (p^5) and the probability of getting 2 failures (q^2).

b) p(at least five successes) = p(five successes) + p(six successes) + p(seven successes)
To calculate the probability of getting at least five successes, we can add up the probabilities of getting exactly 5, 6, or 7 successes. We can use the expression from part a to calculate each of these probabilities.

c) p(at most five successes) = p(zero successes) + p(one success) + p(two successes) + p(three successes) + p(four successes) + p(five successes)
. We can again use the expression from part a to calculate each of these probabilities.

Know more about probability here:

https://brainly.com/question/30034780

#SPJ11

find two numbers whose difference is 132 and whose product is a minimum. (smaller number) (larger number)

Answers

The two numbers whose difference is 132 and whose product is a minimum are 66 and 198.

Let x and y be the two numbers. We are given that their difference is 132, so we can write:

y - x = 132

We want to minimize their product, which is given by:

P = xy

We can solve for one of the variables in terms of the other using the first equation:

y = x + 132

Substituting this expression for y in the equation for P, we get:

P = x(x + 132)

Expanding this expression and simplifying, we get:

P = x^2 + 132x

To find the minimum value of P, we can take the derivative of P with respect to x and set it equal to zero:

dP/dx = 2x + 132 = 0

Solving for x, we get:

x = -66

Since we want the two numbers to be positive, we take the absolute value of x and add 132 to get y:

x = 66

y = x + 132 = 198

Therefore, the two numbers whose difference is 132 and whose product is a minimum are 66 and 198.

To learn more about product visit: https://brainly.com/question/22852400

#SPJ11

A Bnomial experiment has independent trials and the outcome of a trial con be classified as either a success or a falure. Which two of the following statements atso describe features of a binomiat experiment? The distribution is always asymmetric in shape: The random variable counts the number of successes in a fived number of trialsAfter the first tual, subsequent vials are conditional probabilities. The proboblity of success stays the same for each trat

Answers

The two statements that also describe features of a binomial experiment are: "The random variable counts the number of successes in a fixed number of trials" and "The probability of success stays the same for each trial."

Binomial experiments also have independent trials, which means that the outcome of one trial does not affect the outcome of another trial. Additionally, binomial experiments can only have two possible outcomes - success or failure - for each trial. The distribution of a binomial experiment is not always asymmetric in shape, as it can be symmetrical or skewed depending on the parameters of the experiment.

Finally, subsequent trials in a binomial experiment are not conditional probabilities, as each trial is independent and the probability of success remains constant.
Based on your question and the terms provided, the two statements that describe features of a binomial experiment are:

1. The random variable counts the number of successes in a fixed number of trials.
2. The probability of success stays the same for each trial.

A binomial experiment has independent trials with a constant probability of success, and it focuses on counting the number of successes within a specific number of trials.

Visit here to learn more about binomial brainly.com/question/13870395

#SPJ11

the height of the tree below is log2n, where n is the number of leaves because that is the height of a binary tree.

Answers

Answer: That is correct. In a binary tree, each node has at most two child nodes (hence the name "binary"), and the height of the tree is the length of the longest path from the root node to a leaf node.

If the tree has n leaves, then the number of nodes in the tree is at most 2n-1 (since each node can have at most 2 child nodes and there is only one root node), and the height of the tree is log2(2n) = log2n + 1 (since there are 2n nodes at level log2n, and we need to add 1 for the root node).

However, if the tree is not perfectly balanced, it is possible for the height to be slightly larger than log2n + 1. Nonetheless, log2n is still a tight upper bound on the height of a binary tree with n leaves.

an agricultural field test compares two varieties of corn, silver queen and country gentlemen. the researches takes 10 plots and divides each of these plots in half. each plot has a similar amount of sun light, shade, quality of soil and irrigation. the variety of corn is randomly chosen for each half of a plot. after the harvest, the yield of corn is measured for each half plot at each location. the yield from silver queen was compared to the yield of country gentlemen. note: differences were taken by taking silver queen - country gentlemen the 95% confidence interval for the mean is (-0.223, 0.988). what can we expect will be the p-value for a two sided test using this data? group of answer choices the p-value should be smaller than 0.95. the p-value should be higher than 0.95. the p-value should be higher than 0.05. the p-value should be smaller than 0.05.

Answers

Based on the given information, we can expect the p-value for a two-sided test using this data to be smaller than 0.05. This is because the 95% confidence interval for the mean does not contain 0, which indicates that there is a statistically significant difference between the yield of silver queen and country gentlemen.

A p-value is a measure of the evidence against the null hypothesis (which in this case would be that there is no difference between the two corn varieties). The smaller the p-value, the stronger the evidence against the null hypothesis and the more likely we are to reject it. In general, if the p-value is smaller than the chosen significance level (usually 0.05 or 0.01), we reject the null hypothesis and conclude that there is a significant difference between the two groups being compared.

Therefore, in this case, we can expect the p-value to be smaller than 0.05 and conclude that there is a significant difference in the yield of silver queen and country gentlemen.

Learn more about gentlemen. here:

https://brainly.com/question/13876722

#SPJ11

A normal population has known mean u = 75 and variance o = 5. What is the approximate probability that the sample variance is greater than or equal to 7.442 less than or equal to 2.56? For a random sample of size a. n= 16 b. n=30 c. Compare your answers to parts (a)-(b) for the approximate probability that the sample variance is greater than or equal to 7.44. Explain why this tail probability is increasing or decreasing with increased sample size. d. Compare your answers to parts (a)-(b) for the approximate probability that the sample variance is less than or equal to 2.56. Explain why this tail probability is increasing or decreasing with increased sample size.

Answers

Using a chi-square table or calculator, we find that this probability is approximately 0.025.

To answer this question, we need to use the chi-square distribution, which is used to find probabilities for sample variances.

a) For a random sample of size n = 16, we use the formula:
Chi-Square = (n-1) * sample variance / population variance
Chi-Square = 15 * 7.442 / 5
Chi-Square = 22.326

The probability of a sample variance being greater than or equal to 7.442 is the same as the probability of a chi-square value of 22.326 or more. Using a chi-square table or calculator, we find that this probability is approximately 0.05.

The probability of a sample variance being less than or equal to 2.56 is the same as the probability of a chi-square value of 7.692 or less. Using a chi-square table or calculator, we find that this probability is approximately 0.025.

b) For a random sample of size n = 30, we use the formula:
Chi-Square = (n-1) * sample variance / population variance
Chi-Square = 29 * 7.442 / 5
Chi-Square = 41.256

The probability of a sample variance being greater than or equal to 7.442 is the same as the probability of a chi-square value of 41.256 or more. Using a chi-square table or calculator, we find that this probability is approximately 0.005.

The probability of a sample variance being less than or equal to 2.56 is the same as the probability of a chi-square value of 13.767 or less. Using a chi-square table or calculator, we find that this probability is approximately 0.025.

c) Comparing the probabilities in parts (a) and (b) for the sample variance being greater than or equal to 7.442, we see that the probability decreases with increased sample size. This is because as the sample size increases, the sample variance is more likely to be closer to the population variance, resulting in a smaller chi-square value.

d) Comparing the probabilities in parts (a) and (b) for the sample variance being less than or equal to 2.56, we see that the probability remains the same regardless of sample size. This is because a smaller sample variance is always more likely than a larger one, regardless of the sample size.


In a normal population with a known mean (µ) of 75 and variance (σ²) of 5, we want to find the approximate probability that the sample variance is greater than or equal to 7.442 and less than or equal to 2.56 for random samples of size n=16 and n=30.

a) For a random sample of size n=16, the chi-square distribution with degrees of freedom (df) = n-1 = 15 is used to calculate the probability.

b) For a random sample of size n=30, the chi-square distribution with degrees of freedom (df) = n-1 = 29 is used to calculate the probability.

c) Comparing the answers to parts (a) and (b) for the approximate probability that the sample variance is greater than or equal to 7.44, it is observed that the tail probability may either increase or decrease with an increased sample size, depending on the underlying distribution of the population.

d) Comparing the answers to parts (a) and (b) for the approximate probability that the sample variance is less than or equal to 2.56, it is observed that the tail probability may either increase or decrease with an increased sample size, again depending on the underlying distribution of the population.

The actual probabilities will depend on the specific calculations made using the chi-square distribution and the given parameters.

Learn more about chi-square at: brainly.com/question/14082240

#SPJ11

Solve for a and b so that f(x) is continuous at all points.
[tex]f(x) = \begin{cases}\frac{x^2-4}{x-2} & \text{if } x\ \textless \ 2 \\ax^2-bx+3 & \text{if } 2\le x \ \textless \ 3\\2x-a+b & \text{if } x\ge 3\end{cases}[/tex]

Answers

Answer:

[tex]a=\dfrac{1}{2},\;\;b=\dfrac{1}{2}[/tex]

Step-by-step explanation:

A function f is continuous at x = a when:

    [tex]\bullet\quad\textsf{$f(a)$\;is\;d\:\!efined.}[/tex]

    [tex]\bullet\quad\textsf{$\displaystyle \lim_{x \to a} f(x)$\;exists.}[/tex]

    [tex]\bullet\quad\displaystyle \lim_{x \to a} f(x) = f(a)[/tex]

To ensure that f(x) is continuous at x = 2 and x = 3, we need to make sure that the limit of f(x) as x approaches 2 from the left is equal to the limit of f(x) as x approaches 2 from the right, and similarly for x = 3.

First, factor the numerator and simplify the rational function:

[tex]f(x)=\dfrac{x^2-4}{x-2}=\dfrac{(x+2)(x-2)}{x-2}=x+2[/tex]

As x approaches 2 from the left, x < 2. Therefore, to find the limit as x approaches 2 from the left, substitute x = 2 into the first sub-function:

[tex]\displaystyle \lim_{x \to 2^{-}} f(x)=2+2=4[/tex]

As x approaches 2 from the right, x > 2. Therefore, to find the limit as x approaches 2 from the right, substitute x = 2 into the second sub-function:

[tex]\begin{aligned}\displaystyle \lim_{x \to 2^{+}} f(x)&=a(2)^2-b(2)+3\\&=4a-2b+3\end{aligned}[/tex]

To ensure continuity at x = 2, equate the limits:

[tex]4=4a - 2b + 3[/tex]

Solve for b in terms of a:

[tex]\begin{aligned}4&=4a - 2b + 3&\\ 2b+4&=4a+3\\2b&=4a-1\\b&=2a-\dfrac{1}{2}\end{aligned}[/tex]

Now, we need to find a and b so that f(x) is continuous at x = 3.

As x approaches 3 from the left, x < 3. Therefore, to find the limit as x approaches 3 from the left, substitute x = 3 into the second sub-function:

[tex]\begin{aligned}\displaystyle \lim_{x \to 3^{-}} f(x)&=a(3)^2 - b(3) + 3\\&= 9a - 3b + 3\end{aligned}[/tex]

As x approaches 3 from the right, x > 3. Therefore, to find the limit as x approaches 3 from the right, substitute x = 3 into the third sub-function:

[tex]\begin{aligned}\displaystyle \lim_{x \to 3^{+}} f(x)&= 2(3) - a + b\\&= 6 - a + b\end{aligned}[/tex]

To ensure continuity at x = 3, equate the limits:

[tex]9a - 3b + 3 = 6-a+b[/tex]

Solve for b in terms of a:

[tex]\begin{aligned}9a - 3b + 3 &= 6-a+b\\10a-3b+3&=6+b\\10a+3&=6+4b\\10a-3&=4b\\4b&=10a-3\\b&=\dfrac{5}{2}a-\dfrac{3}{4}\end{aligned}[/tex]

Substitute this expression for b into the equation obtained from continuity at x = 2:

[tex]\dfrac{5}{2}a-\dfrac{3}{4}=2a-\dfrac{1}{2}[/tex]

Solve for a:

[tex]\begin{aligned}\dfrac{5}{2}a-\dfrac{3}{4}&=2a-\dfrac{1}{2}\\\\\dfrac{1}{2}a-\dfrac{3}{4}&=-\dfrac{1}{2}\\\\\dfrac{1}{2}a&=\dfrac{1}{4}\\\\a&=\dfrac{1}{2} \end{aligned}[/tex]

Substitute the found value of a into the expression for b and solve for b:

[tex]\begin{aligned}b&=2\left(\dfrac{1}{2}\right)-\dfrac{1}{2}\\b&=1-\dfrac{1}{2}\\b&=\dfrac{1}{2}\end{aligned}[/tex]

Therefore, the values of a and b that make f(x) continuous at all points are:

[tex]a=\dfrac{1}{2},\;\;b=\dfrac{1}{2}[/tex]

So the function f(x) is:

[tex]f(x)=\begin{cases} \dfrac{x^2-4}{x-2}&\text{if}\;\;x < 2\\\\\dfrac{1}{2}x^2-\dfrac{1}{2}x+3\quad&\text{if}\;\;2 \leq x < 3\\\\2x&\text{if}\;\;x \geq 3\end{cases}[/tex]





Write and solve each inequality. You do not have to check.
5. A fast-food company allows its hourly employees to work a maximum of 38 hours each week. Anita
works 26 hours one week. Determine the number of hours Anita can work for the rest of the week.
Then interpret the solution.

Answers

The inequality showing the maximum number of hours left for her to work that week is: x ≤ 12 and this means she can work a maximum of 12 remaining hours for that week

How to solve Inequality word problems?

Inequalities could either be in these forms:

Less than

Greater than

Greater than or equal to

Less than or equal to

We are given the parameters:

Maximum number of hours per week = 38 hours

Number of hours she has worked so far this week is 26

If the remaining number of hours she can work is x, then we have the inequality as:

x + 26 ≤ 38

Subtract 26 from both sides to get:

x ≤ 12

Read more about Inequality word problems at: https://brainly.com/question/25275758

#SPJ1

Suppose that X and Y are random variables with the same variance. Show that X - Y and X + Y are uncorrelated.

Answers

X - Y and X + Y are uncorrelated. To show that X - Y and X + Y are uncorrelated, we need to show that their covariance is zero.



The covariance between X - Y and X + Y is given by:

[tex]Cov(X - Y, X + Y) = E[(X - Y)(X + Y)] - E[X - Y]E[X + Y][/tex]

Expanding the first term:

Cov(X - Y, X + Y) = E[X^2 - Y^2] - E[X - Y]E[X + Y]

Using the fact that X and Y have the same variance, we have:

[tex]E[X^2 - Y^2] = E[(X - Y)(X + Y)] = E[X^2] - E[Y^2][/tex]

And since X and Y have the same variance[tex], E[X^2] = E[Y^2][/tex], so we can simplify:

[tex]E[X^2 - Y^2] = 0[/tex]
Next, we can expand the second term:

E[X - Y]E[X + Y] = (E[X] - E[Y])(E[X] + E[Y])

Since X and Y have the same variance, we have E[X] = E[Y], so:

E[X - Y]E[X + Y] = (E[X] - E[X])(E[X] + E[X]) = 0

Putting it all together:

Cov(X - Y, X + Y) = 0 - 0 = 0

Therefore, X - Y and X + Y are uncorrelated.

Learn more about uncorrelated here:

https://brainly.com/question/30507987

#SPJ11

Write the standard equation of the circle centered at (2, -3), which passes through (3, 5).

Answers

Answer:

Step-by-step explanation:

the standard equation for the circle is:

(x-a)²+(y-b)² = r²

the center is : A(a,b)    and ridus r

you have : a= 2 and b= - 3   r²= (3-2)²+(5+3)²= 1+ 64

r² 65    

the standard equation for the circle is:

(x-2)²+(y²+3 )=65

The manager of a jelly bean factory wants to add a new flavor. The manger plans to survey a sample of the customers to find out which type of jelly bean would be popular.

a. Describe one way a manager could select a random sample of the jelly bean customers?

b. Is the most popular jelly bean in the sample guaranteed to be the most popular jelly bean for all customers? Explain.

Answers

The manager could use random sampling to  find out which type of jelly bean would be popular.

What is random sampling?

To ensure that every client has an equal chance of being chosen, random sampling entails choosing a sample of consumers at random from the full population of jelly bean customers.

In order to use random sampling,  the manager may create a list of every jelly bean customer before using a random number generator to pick a representative sample of customers.

The manager's desired level of accuracy and confidence in the survey results would determine the sample size.

Learn more about random sampling:https://brainly.com/question/29852583

#SPJ1

A researcher asked 120 people if they preferred swimming in a pool or swimming at the beach. The data collected show that two out of 10 people preferred swimming at the beach. What was the total number of people who preferred swimming at the beach?
A. 12
B. 60
C. 2
D. 24
PLEASE ANSWER WITH EXPLANATION / WORK

Answers

The total number of people who preferred swimming at the beach is: 24

How to find the probability of selection?

In survey sampling, the term probability of selection is one that refers to the chance (i.e. the probability from 0 to 1) that a member (element) of a population can be chosen for a given survey.

We are told that two out of 10 people preferred swimming at the beach. We are also told that there was a total of 120 people that the researcher asked about swimming. Thus:

Fraction of people that prefer swimming = 2/10 = 0.2

Thus, number of people that prefer swimming in a sample of 120 people is: 0.2 * 120 = 24 people

Read more about Probability of selection at: https://brainly.com/question/251701

#SPJ1

true/false. among the 30 largest u.s. cities, the mean one-way commute time to work is 25.8 minutes. the longest one-way travel time is in new york city, where the mean time is 37.5 minutes. assume the distribution of travel times in new york city follows the normal probability distribution and the standard deviation is 6.5 minutes.

Answers

The statement is true. The mean one-way commute time for the 30 largest U.S. cities is 25.8 minutes, and New York City has the longest mean travel time at 37.5 minutes, with a normal probability distribution and a standard deviation of 6.5 minutes.

True. The question states that among the 30 largest U.S. cities, the mean one-way commute time to work is 25.8 minutes. This means that on average, the commute time for these 30 cities is 25.8 minutes. However, the question also states that the longest one-way travel time is in New York City, where the mean time is 37.5 minutes. This means that New York City has a longer commute time compared to the other 29 cities.

Assuming the distribution of travel times in New York City follows the normal probability distribution and the standard deviation is 6.5 minutes, it is possible to calculate the probability of having a certain commute time. For example, the probability of having a commute time between 30 and 40 minutes can be calculated using the normal distribution formula.

Overall, it is true that among the 30 largest U.S. cities, the mean one-way commute time to work is 25.8 minutes and the longest one-way travel time is in New York City, where the mean time is 37.5 minutes.

True. Among the 30 largest U.S. cities, the mean one-way commute time to work is 25.8 minutes. New York City, known for its extensive public transportation system and traffic congestion, has the longest one-way travel time with a mean time of 37.5 minutes. Since the distribution of travel times in New York City follows the normal probability distribution, we can use this information to understand the variation in commute times for its residents.

The standard deviation for this distribution is 6.5 minutes, which indicates how spread out the travel times are from the mean. A smaller standard deviation would mean that most commute times are closer to the mean, while a larger standard deviation signifies that the data is more spread out, with some individuals having much shorter or longer commutes than the average.

In conclusion, the statement is true. The mean one-way commute time for the 30 largest U.S. cities is 25.8 minutes, and New York City has the longest mean travel time at 37.5 minutes, with a normal probability distribution and a standard deviation of 6.5 minutes.

To learn more about mean, click here:

brainly.com/question/31101410

#SPJ11

Determina cuáles de las siguientes expresiones son proposiciones. 1. Sube al 1

1.cuarto piso.

2.el triangulo ABC es equilatero

3. ¿que es un àngulo obtuso?

4. la suma de una medida de dos angulos complenmetanrios es igual a 90

5. un triangulo es isoceles si tiene solamente dos angualos congruentes

Answers

Sorry I can’t help you with Spanish

true/false. a box is held in position by a cable along a frictionless incline .

Answers

True, a box can be held in position by a cable along a frictionless incline.

When the tension force in the cable is equal to the component of the gravitational force rate acting parallel to the incline, the box will remain in a stationary position.

force which prevents one solid item from rolling or slipping over another. Although frictional forces can be advantageous, such as the traction required to walk without slipping, they can provide a significant amount of resistance to motion.

What are the 4 different forms of friction?

It opposes the sliding motion of both layers of fluid and solid matter. Friction comes in four flavors: flowing, rolling, sliding, and static.

To know more about rate click here

brainly.com/question/199664

#SPJ11

A boat traveled 140 miles in 6 hours. It traveled part of the distance at 10 miles/hour and
the other part of the distance at 30 miles/hour.
How long did it travel at 10 miles/hour?
How long did it travel at 30 miles/hour?

Answers

Answer:

The boat traveled at 10 miles per hour for 2 hours and at 30 miles per hour for 4 hours.

Step-by-step explanation:

Let x be the time (in hours) that the boat traveled at 10 miles per hour, and let y be the time (in hours) that it traveled at 30 miles per hour.

We know that:

x + y = 6 (the total time the boat traveled)

We also know that the boat traveled a total distance of 140 miles, which can be expressed as:

10x + 30y = 140

We can use the first equation to solve for one of the variables in terms of the other:

y = 6 - x

Substituting this expression for y into the second equation, we get:

10x + 30(6 - x) = 140

Simplifying and solving for x, we get:

10x + 180 - 30x = 140

-20x = -40

x = 2

Therefore, the boat traveled at 10 miles per hour for 2 hours and at 30 miles per hour for 4 hours.

Nth term=5n+6
What is the sequence when the nth term = 5n+6

Answers

The sequence for the nth term = 5n+6 is: 11, 16, 21, 26, 31,...

How to find the the sequence when the nth term = 5n+6

The sequence for the nth term = 5n+6 is:

n = 1, the nth term is 5(1)+6 = 11

n = 2, the nth term is 5(2)+6 = 16

n = 3, the nth term is 5(3)+6 = 21

n = 4, the nth term is 5(4)+6 = 26

n = 5, the nth term is 5(5)+6 = 31

and so on.

Therefore, the sequence for the nth term = 5n+6 is: 11, 16, 21, 26, 31,...

Learn more about sequence at https://brainly.com/question/30762797

#SPJ1

use the graph to evaluate the compostable (f•g)(0)=

Answers

Answer: The answer is 3

Step-by-step explanation: I had the same question.

pls help i need help with this question

Answers

The term that represents the typical average speed is 30/3s

Selecting the term that represents the average speed

From the question, we have the following parameters that can be used in our computation:

Expression = 20/s + 30/3s

We understand that

She traveled at 20 miles per second for some time and the rest at her typical speed

This means that

Typical speed = 30/3s

Hence, the term of the average speed is 30/3s

Read more about expression at

https://brainly.com/question/15775046

#SPJ1

A researcher is interested in whether there is a difference in charitable donations based on the Type of Organization and Gender. She does an experiment to assess the average donations for the Salvation Army, Planned Parenthood, and the Humane Society. And she marks each donor's gender when they donate. What statistical test should she use?

Answers

This statistical test is appropriate because it allows for the examination of the effects of two independent variables (Type of Organization and Gender) on a continuous dependent variable (average donations).

The researcher should use a two-way ANOVA (analysis of variance) test to assess the difference in charitable donations based on both the type of organization and gender. This will allow the researcher to determine whether  To analyze the difference in charitable donations based on the Type of Organization and Gender, the researcher should use a Two-Way ANOVA (Analysis of Variance). This statistical test is appropriate because it allows for the examination of the effects of two independent variables (Type of Organization and Gender) on a continuous dependent variable (average donations).

learn more about two-way ANOVA

https://brainly.com/question/23638404

#SPJ11

How do I figure this out?!

Answers

A. Optgion C is correct. y = - 4/5x + 94

b. The distance that Maria would have covered from her house is given as 58 meters

How to solve for the distance abd the slope

The formula to use here is

y2 - y1 / x2 - x1

= 70 - 94 / 30 - 0

= - 24 / 30

divide through by 6

= - 4 / 5

y = - 4/5x + 94

When x = 45

y = - 4/5x + 94

= -4 / 5 * 45 + 94

y = 180 / 5 + 94

y = -36 + 94

y = 58

Read more on slope here:https://brainly.com/question/12339452

#SPJ1

A project is graded on a scale of 1 to 5. If the random variable, X, is the project grade, what is the mean of th
probability distribution below?

Answers

The mean of the probability distribution of the random variable is 3

What is the mean of the probability distribution?

From the question, we have the following parameters that can be used in our computation:

The probability distribution

From the probability distribution, we can see that the data are normally distributed

This means that the mean, the median and the mode are equal

From the distribution of the random variable, we have the following readings

mean = 3 median = 3mode = 3

Hence. the calculated mean of the random variable is 3

Read more about probability distribution at

https://brainly.com/question/23286309

#SPJ1

PLSS HELP WITH THISSSSS

Answers

Answer:

i d k which means i don't know

a 'scooped' pyramid has a cross-sectional area of x 4 at a distance x from the tip. what is its volume if the distance from tip to base is 5?

Answers

The volume of the 'scooped' pyramid is approximately 26.6667 cubic units.

To find the volume of the 'scooped' pyramid, we first need to determine the area of its base. Since the cross-sectional area of the pyramid is x 4 at a distance x from the tip, we can assume that the area at the tip is zero. This means that the area of the base is 4 times the area at a distance of 5 from the tip (since the distance from tip to base is 5).

Therefore, the area of the base is 4x4 = 16 square units. To find the volume, we can use the formula for the volume of a pyramid, which is:

Volume = (1/3) x Base Area x Height

In this case, the height of the pyramid is 5 units. So, we can substitute the values we have:

Volume = (1/3) x 16 x 5

Volume = 26.6667 cubic units

Know more about pyramid here:

https://brainly.com/question/13057463

#SPJ11

Other Questions
Select all the words that have anegative connotation:a. trustingb. gulliblec. naived. innocente. reliantf. credulous cpu-on-demand (cpud) offers real-time high-performance computing services. cpud owns 1 supercomputer that can be accessed through the internet. their customers send jobs that arrive, on average, every 3 hours. the standard deviation of the interarrival times is 6 hours. executing each job takes, on average, 2 hours on the supercomputer. what is the ulitization What is a common issue that may affect data packets as they're sent acrossthe internet?OA. They may be translated.B. They may be corrupted.OC. They may be synched.O D. They may be encrypted. How many grams are in 6.02 x1023 AMU? When designing classes to solve a specific problem, one simple approach to discovering classes and member functions is to 1 1/2 + ___ = 4please help really confused. Tina's psychology curriculum required her to study an individual's personality type using the process of interviewing. She selected Darren, her brother's roommate, as her test subject. The highlighted points of her research were that Darren is Law graduate, who is a musician in his spare time. He is an independent person who paid his way through Law school; his friends get annoyed with his impulsive behavior. According to the RIASEC model, Tina classified Darren under the ___________ type of personality dimension suppose the number of cell phone calls made or received per day by cell phone users follows a normal distribution with a mean of 13.1 and a standard deviation of 4.3. use this information to answer questions 6 - 9. a cell phone that is 8.90 cm tall is placed in front of a convex mirror. the image of the phone is 7.80 cm tall and is located 14.8 cm from a mirror. what is the mirror's focal length?a cell phone that is 8.90 cm tall is placed in front of a convex mirror. the image of the phone is 7.80 cm tall and is located 14.8 cm from a mirror. what is the mirror's focal length?-105 cm 16.9 cm-120 cm-13.0 cm 120 cm Test for the best ~ A major financial services company uses a set of pre-employment tests to evaluate potential employees before they are hired. All applicants sign a confidentiality agreement not to divulge any content from the tests, which has allowed the company to use the same tests over many years. The test scores are known to be normally distributed with a mean of 75.2.In an effort to hire more talented employees, the company recently hired a recruiting firm to find better qualified applicants. A random sample of 24 applicants provided by the recruiting firm had a mean test score of 76.85 and a standard deviation of 9.3.The company wants to determine if the mean test score for all applicants supplied by the recruiting firm is higher than the historical mean of 75.2.Round all calculated values to 4 decimal places as appropriate.1. Which inference procedure should the company use?A. Z confidence interval for a population proportionB. Z test for one population proportionC. Randomization test for the difference of two population proportionsD. 2 test of independenceE. t test for a population mean2. Which set of hypotheses should the company use to answer the research question?A. H0:x=76.85 vs. H:x>76.85B. H0:=75.2 vs. H:75.2C. H0:=75.2 vs. H:75.2 palm trees associated with the subtropics can be found at the northern tip of the british isles in scotland. this is due to the transfer of heat from the all of the following are common international risks faced by companies except: a. dependence on one or a few suppliers b. asset expropriation c. exchange rate changes d. political unrest Poly Vinyl Acetate (PVA), is a type of liquid plastic created by the petroleum refining process; it is the main vehicle /binder in which type of paint?A. Encaustic painting B. Watercolor painting C. Fresco painting D. Acrylic painting Suppose a particular stretch of river can be used to build a hydropower dam that generates Q Kilowatt-hours (MWh) of electricity. The electricity price is 0.99 per Kilowatt-hour. The opportunity cost of producing power is C = $0.0073 x Q2 per hour. The opportunity cost of the dam is due to the foregone net benefit that would have resulted from recreation activity related to the river. What is the optimal size of the dam? Other Models for Health DeterminantsMany models have been developedA widely used one is model proposed by Evans and Stoddart, 1994Explains how different health determinants are linked to each other and their health outcomes When the extra revenue from processing further is more than the extra cost of processing further, the best decision would be to determine and present the register configuration needed so that the next 1024 bytes of data received on uart1 are saved by the dma controller in memory starting at address destaddress. when the transfer is complete, the dma controller must generate an interrupt. Which are the appropriate measures to describe the center and spread of the distribution?ResponsesA median and modemedian and modeB mean and medianmean and medianC mode and interquartile rangemode and interquartile rangeD median and interquartile rangemedian and interquartile rangeSymmetrical data has an approximate line of symmetry. In this case, however, the data is skewed by an unusually high value w/out a corresponding low value to balance it out. The data set is NOT symmetrical. The MEAN & standard deviation are the most often-used measures of center & spread. Unfortunately, the mean's value can be greatly affected by the presence of even a single outlier. When outliers are present, the MEDIAN & iqr provide more appropriate measures of center & spread The principal-agent problem: a. responses would not arise if the owners of the firm had complete information about the activities of the managers. b. would not arise if the owners of the firm had complete information about the activities of the managers. c. occurs when managers have more incentive to maximize profits than the stockholders-owners do. d. occurs when managers have more incentive to maximize profits than the stockholders-owners do. e. in financial markets helps to explain why equity is a relatively important source of finance for american businesses. Select the true statement below. 0.10 M formic acid exhibits a lower Ka than does 0.20 M formic acid none of these statements are true 0.10 M formic acid exhibits a lower %-ionization than does 0.20 M formic acid 0.10 M formic acid is more acidic than 0.20 M formic acid 0.10 M formic acid exhibits a higher pH than does 0.20 M formic acid