pls help due in an hour ill mark you brainilest

Step 1: The sample mean is (24+6+21+8+16+10+18)/7 = 15.7 (rounded to one decimal place)

Step 2: The sample standard deviation is calculated using the formula:

s = sqrt[(Σ(x - mean of x)^2) / (n - 1)]

where Σ is the sum of the squared deviations from the mean, mean of x is the sample mean, and n is the sample size.

Using the given data, we get:

s = sqrt[((24-15.7)^2 + (6-15.7)^2 + (21-15.7)^2 + (8-15.7)^2 + (16-15.7)^2 + (10-15.7)^2 + (18-15.7)^2) / (7-1)]

s = 6.679 (rounded to one decimal place)

Step 3: To find the critical value, we use a t-distribution with n-1 degrees of freedom and a confidence level of 80%. From a t-distribution table or using a calculator, we find the critical value to be 1.397 (rounded to three decimal places).

Step 4: Using the formula for the confidence interval:

CI = mean of x ± t*(s / sqrt(n))

where mean of x is the sample mean, t is the critical value, s is the sample standard deviation, and n is the sample size.

Plugging in the values, we get:

CI = 15.7 ± 1.397*(6.679 / sqrt(7))

CI = (9.47, 21.93)

So the 80% confidence interval for the average net change in a student's score after completing the course is (9.47, 21.93).

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Null hypothesis: The percentage of stocks traded on the NYSE that went up on January 31, 2006, is not 30%.

Alternative hypothesis: The percentage of stocks traded on the NYSE that went up on January 31, 2006, is 30%.
To test the financial analyst's claim that 30% of the stocks traded on the NYSE went up on the same day, we can formulate the null and alternative hypotheses using the information about the DJIA stock market performance. Here are the hypotheses:
Null Hypothesis (H0): The proportion of stocks that increased in price on the NYSE is 30% (p = 0.30).
Alternative Hypothesis (H1): The proportion of stocks that increased in price on the NYSE is not 30% (p ≠ 0.30).
These hypotheses will help determine whether the analyst's claim about the overall stock market performance is accurate or not.

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The number of repeating digits in the group is 1

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

Number = 2/9

When evaluated, we have

Number = 0.222.....

The above nummber has repeating digits

When approximated, we have

Number = 0.2

In the above number, the number of repeating digits is 1

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When rolling a six-sided die, there are six possible outcomes: 1, 2, 3, 4, 5, or 6. Event B is rolling an even number, which means there are three possible outcomes: 2, 4, or 6. Since there are only three possible outcomes in Event B, it is a simple event.
Let's analyze the event and outcomes when rolling a six-sided die.

Event B: Rolling an even number.

Step 1: Identify the possible outcomes.
When rolling a six-sided die, the outcomes are numbers 1 to 6 (1, 2, 3, 4, 5, and 6).

Step 2: Determine the outcomes in the event.
For Event B, the even numbers are 2, 4, and 6. So, there are 3 outcomes in Event B.

Step 3: Decide if the event is a simple event or not.
An event is considered a simple event if it has only one possible outcome. Since Event B has 3 possible outcomes (2, 4, and 6), it is not a simple event.

Event B (rolling an even number) has 3 possible outcomes (2, 4, and 6), and it is not a simple event.

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Overall, while the use of volunteers does not automatically make the study invalid, it is important to carefully consider probability of bias and take steps to minimize them in the study design and analysis.

The use of volunteers in this study does not necessarily make it invalid, but it could introduce potential sources of bias. Volunteers may not be representative of the larger population of individuals with painful diabetic neuropathy, as they may be more willing to participate in the study or may have different levels of disease severity or other factors that could affect their response to treatment.

Additionally, the random assignment of participants to the gabapentin or placebo group helps to minimize bias, but there is still a possibility of confounding variables that could influence the results. For example, if individuals who were assigned to the gabapentin group were more likely to adhere to the treatment regimen or had more social support, this could influence the outcome of the study independent of the drug's effectiveness.

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Answer:

the answer is B

Step-by-step explanation:

you find the answer by exchanging and canceling the number to find the value of x

[tex]/ \frac{x}{3} \leqslant - 6 \\ (\frac{1x}{3}) \frac{3}{1} \leqslant - 6( \frac{3}{1} ) \\ x = - 18[tex]/

Answer:

£14.75.

Step-by-step explanation:

1. Find how much 1 tub of ice cream cost. We can find this by dividing the cost of the 2 tubs in half:

5.90 / 2 = 2.95 = 1 tub ice cream

2. Multiply the cost of 1 tub of ice cream (2.95) by 5 to know the price of the 5 tubs:

2.95 x 5 = 14.75

Hence, 5 tubs of ice cream cost £14.75.

Answer:

150

Step-by-step explanation:

An equilateral triangle has 3 congruent angles.

Each angle of an equilateral triangle measures 60°.

A square has 4 right angles.

Each angle of a square measures 90°.

The measures of the 2 angles of equilateral triangle and one right angle of the square have a total measure of

60° + 60° + 90° = 210°

A full circle has a degree measure of 360°.

x° = 360° - 210°

x = 150

The first term of the geometric series is 16.

Using the formula for the sum of a geometric series to solve for the first term (a₁):

Sn = a₁(1 - rⁿ)/(1 - r)

Substituting the given values, we get:

-26,240 = a₁(1 - (-3)⁸)/(1 - (-3))

Simplifying the exponent and denominator, we get:

-26,240 = a₁(1 - 6,561)/(4)

-26,240 = a₁(-6,560/4)

-26,240 = a₁(-1,640)

Dividing both sides by -1,640, we get:

a₁ = 16

Therefore, the first term of the geometric series is 16.

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Answer:

When a coin is tossed 9 times the probability of getting exactly six heads is obtained with the help of Bernoulli trials. The probability of getting exactly six heads is 21/128.

Answer:

$80

Step-by-step explanation:

please mark brainliest answer

Mr. Simon can serve 26 people with 20 containers of soup.

Given that: Mr.Simon has 20 containers of soup. 3 containers of soup feeds 4 people.

Frst, we need to know how many people can be fed by one container of soup.

We are given that 3 containers of soup can feed 4 people.

Hence, we can calculate how many people one container of soup can feed by dividing 4 people by 3 containers

One person ⇒  4/3

Next, we multiply the number of people per container by the total number of containers, which is 20 in this case.

This gives us:

= 20 × (4/3)

= 80/3

= 26.667

≈ 26

Mr. Simon can feed 80/3 people with 20 containers of soup. However, since we cannot serve a fractional part of a person, we should round the answer to a whole number. In this case, rounding down gives us 26.

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They may require more advanced techniques from dynamical systems theory to fully understand the behavior of the system.

If both eigenvalues of a critical point of a linear system of differential equations in two dimensions are real and equal, the critical point is a degenerate node.

The behavior of the solutions near a degenerate node depends on the higher-order terms in the Taylor series expansion of the vector field around the critical point. Specifically, the critical point is asymptotically stable if the higher-order terms in the Taylor series expansion satisfy certain conditions, and unstable otherwise.

If the higher-order terms in the Taylor series expansion satisfy the so-called "center manifold" conditions, then the critical point is a center, and the solutions near the critical point exhibit periodic behavior.

In general, the classification of a critical point with real and equal eigenvalues can be more complicated than the case where the eigenvalues have different signs, and may require more advanced techniques from dynamical systems theory to fully understand the behavior of the system.

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There is no such vector-valued function r(t) that satisfies the given condition.

I. There is no such vector ū that satisfies u + ū = (1, 2) because if we add any vector to u, we change its direction and magnitude, but the vector ū should have the same magnitude and opposite direction to u.

II. Let v = (1, 3, -1). Then u + v = (2+1, 1+3, 3-1) = (3, 4, 2) and u x v = (-5, 7, -1). So u x v = u + v. Therefore, v satisfies the given condition.

III. There is no such vector-valued function r(t) because if r(t) = (x(t), y(t)) satisfies the condition that r'(t) = 2r(t), then we have:

x'(t) = 2x(t) and y'(t) = 2y(t)

These are two separate first-order differential equations, which have general solutions of the form:

x(t) = c1e^(2t) and y(t) = c2e^(2t)

where c1 and c2 are constants determined by the initial conditions. However, the vector-valued function r(t) = (x(t), y(t)) cannot have a constant magnitude because its components are functions of t that grow exponentially with time. Therefore, there is no such vector-valued function r(t) that satisfies the given condition.

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Answer:

D: bar graph with the title favorite sport and the x axis labeled sport and the y axis labeled number of students, with the first bar labeled baseball going to a value of 17, the second bar labeled basketball going to a value of 12, the third bar labeled tennis going to a value of 27, and the fourth bar labeled soccer going to a value of 44

Step-by-step explanation:

Because the categories are unrelated to each other it would be unlikely that you would use a histogram in this situation. Histograms are often only used for change or continuous data about a particular group or sample.

D is correct becuase it makes use of a bar graph and the number of players per section are correctly allocated unlike answer choice C which switches some sports and the number of players they should have.

Answer: histogram with the title favorite sport and the x axis labeled sport and the y axis labeled number of students, with the first bar labeled baseball going to a value of 17, the second bar labeled basketball going to a value of 12, the third bar labeled tennis going to a value of 27, and the fourth bar labeled soccer going to a value of 44

Step-by-step explanation:

The area of the triangle in this problem is given as follows:

A = 479.3 m².

First we must use the law of sines to obtain the measure of angle A as follows:

sin(A)/31 = sin(105º)/50

Hence:

sin(A) = 31 x sine of 105 degrees/50

sin(A) = 0.5989

A = arcsin(0.5989)

A = 36.8º.

Considering that the sum of the measures of the internal angles of a triangle is of 180º, the measure of angle B is given as follows:

36.8º + <B + 105º = 180º

<B = 180 - (36.8 + 105)

<B = 38.2º.

We have two sides of 50m and 31m, with an angle between them of 38.2º, hence the area of the triangle is given as follows:

A = 0.5 x 50 x 31 x sine of 38.2 degrees

A = 479.3 m².

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If we let a = 0, b = 1, and c = 1, then the polynomial

[tex]x(x-1)(x^2 +[/tex]

Since the polynomial has integer coefficients, if one of the roots is a complex number, then its conjugate must also be a root. Therefore, options A and E cannot be roots of the polynomial, since they have non-real conjugates.

We know that the polynomial has degree 4, so it has four roots in total (counting multiplicities). We also know that two of the roots are integers, so let's call them a and b. Then the polynomial can be written as:

[tex](x - a)(x - b)(cx^2 + dx + e)[/tex]

where c, d, and e are integers (because they are the coefficients of the quadratic factor). We know that the leading coefficient is 1, so c must be nonzero.

Since the polynomial has two real roots, its discriminant must be nonnegative:

[tex]d^2 - 4ce > = 0[/tex]

We can use this inequality to rule out some of the answer choices. For example, option C cannot be a root, because if we substitute x = 1/2 + i into the polynomial, we get:

([tex](1/2 + i) - a)((1/2 + i) - b)(c((1/2 + i)^2) + d(1/2 + i) + e)[/tex]

The real part of this expression is:

(1/4 - a + 1/4 - b)(c(1/4 - 1) + d/2 + e) = -(a + b - 1/2)(3c/4 + d/2 + e)

If we assume that a and b are integers, then this expression is an integer multiple of 3c/4 + d/2 + e. However, we can choose values of c, d, and e such that 3c/4 + d/2 + e is not an integer (for example, if c = 4, d = 1, and e = 0, then 3c/4 + d/2 + e = 4.5). Therefore, the real part of the expression cannot be zero, and option C cannot be a root.

We can also rule out option D using the same argument. If we substitute x = 1 + i/2, then the real part of the expression is:

((1 + i/2) - a)((1 + i/2) - b)(c((1 + i/2)^2) + d(1 + i/2) + e)

(1 - a + i/2)(1 - b + i/2)(c(5/4 + i) + d(3/2 + i/2) + e)

The real part of this expression is an integer multiple of c(5/4) + d(3/2) + e, which can be non-integer for some choices of c, d, and e.

Therefore, the only possible answer choices are A and B. To determine whether they are roots of the polynomial, we can use the fact that the sum and product of the roots are given by:

a + b + (complex roots) = -d/c

ab(complex roots) = e/c

We know that a and b are integers, so if we can find a polynomial with integer coefficients that has roots a, b, and either A or B, then that root is also a root of the original polynomial.

For option A, we have:

1 + i√11/2 = 2(cos(75°) + i sin(75°))

Therefore, if we let a = 0, b = 1, and c = 1, then the polynomial

[tex]x(x-1)(x^2 +[/tex]

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Answer:

(Excluding Xion) Each person will get 2 1/4 brownies

Step-by-step explanation:

9 brownies distributed equally to 4 friends.  If each person gets two brownies, there is one left over.  Divide 1 by 4 and you get 1/4.  1/4 in decimal form is 0.25.  2+0.25=2.25

Or you could just use a calculator to divide 9 by 4 and it would come up with 2.25

This statement is not necessarily true.

A real matrix can have real or complex eigenvalues.

A real matrix can have real or complex eigenvalues. The number of real eigenvalues of a matrix may be even or odd, and there is no general rule that determines the parity of the number of real eigenvalues.

For example, the 5x5 real matrix

```
[ 0  1  0  0  0 ]
[ 1  0  0  0  0 ]
[ 0  0  0  1  0 ]
[ 0  0  1  0  0 ]
[ 0  0  0  0  1 ]
```

has two real eigenvalues (1 and -1), which is an even number.

On the other hand, the 5x5 real matrix

```
[ 1  1  0  0  0 ]
[ 1  1  0  0  0 ]
[ 0  0  1  1  0 ]
[ 0  0  1  1  0 ]
[ 0  0  0  0  0 ]
```

has three real eigenvalues (2, 0, and -1), which is an odd number.

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The 99% confidence interval for the average number of hours a student spends studying for a statistics exam is (2.059, 5.941) hours.

To find a 99% confidence interval for the average number of hours a student spends studying for a statistics exam, we can use the formula:

CI = x ± z*(o/sqrt(n))

where CI is the confidence interval, x is the sample mean, z is the z-score for the desired confidence level (in this case, 99%), o is the population standard deviation, and n is the sample size.

Plugging in the given values, we get: CI = 4 ± 2.576*(6.25/sqrt(50)) CI = 4 ± 1.941 CI = (2.059, 5.941)

Therefore, the 99% confidence interval for the average number of hours a student spends studying for a statistics exam is (2.059, 5.941) hours.

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The expected value E(Y) = 5.6, Var(Y) = 326.64 and σ ≈ 18.07.

(a) To compute the expected value E(Y), we need to multiply each value of y with its corresponding probability and sum them up. Here's the calculation:
E(Y) = (2 * 0.10) + (4 * 0.40) + (7 * 0.20) + (8 * 0.30) = 0.2 + 1.6 + 1.4 + 2.4 = 5.6
(b) To compute the variance Var(Y) and standard deviation σ, we first need to find E(Y^2) and then use the formula Var(Y) = E(Y^2) - (E(Y))^2.
E(Y^2) = (2^2 * 0.10) + (4^2 * 0.40) + (7^2 * 0.20) + (8^2 * 0.30) = 4 + 64 + 98 + 192 = 358
Now, we can compute Var(Y):
Var(Y) = E(Y^2) - (E(Y))^2 = 358 - (5.6)^2 = 358 - 31.36 = 326.64
Finally, we can compute the standard deviation σ:
σ = sqrt(Var(Y)) = sqrt(326.64) ≈ 18.07

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The probability of having factor of 72 and even will be 0.75.

The prime factorization of 72 is 2^3 * 3^2. It should be noted that to find the number of factors of 72, one must add 1 to each exponent in the prime factorization and multiply accordingly: (3+1) * (2+1) = 12.

Therefore the factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36 and 72.

Evidently, 9 of these 12 factors will be even since they contain at least one factor of 2; thus, 6 of the factors of 72 are even.

The probability will be:

= 9/12

= 0.75

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Step-by-step explanation:

Area of the circular end  x height = volume

pi r^2  * h    = volume        r = 1/2 * 7 = 3.5 yds

pi * (3.5^2) * 12 =~ 462 yd^3

The optimal dimensions for the two adjacent rectangular corrals are: length = 80 feet, width = 20 feet.

Let's call the dimensions of the two adjacent rectangular corrals "width" and "length," and represent them by the variables w and l, respectively. The total length of fencing available is 160 feet, so the total amount of fencing used is:

P = 2w + 3l

The factor of 3l in this equation is due to the fact that there are three sides of length l: two of them are shared by the two corrals, and the other one is the outer side of one of the corrals.

The enclosed area of the two corrals is:

A = 2wl

To find the dimensions that maximize the enclosed area, we need to express A in terms of a single variable, either w or l. To do this, we can solve the equation P = 160 for one of the variables:

2w + 3l = 160

2w = 160 - 3l

w = 80 - (3/2)l

Substituting this expression for w into the equation for A, we get:

A = 2(80 - (3/2)l)l

Simplifying and expanding, we get:

A = 160l - (3/2)l^2

This is a quadratic function of l, with a maximum at the vertex of the parabola. The x-coordinate of the vertex is given by:

l = -b / (2a)

where a = -(3/2) and b = 160. Substituting these values, we get:

l = -160 / (2 * -(3/2)) = 80

Therefore, the optimal length of the two corrals is 80 feet. To find the corresponding width, we can use the equation we derived earlier:

w = 80 - (3/2)l = 80 - (3/2)(80) = 20

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Answer:

90

Step-by-step explanation:

If the smaller hole is very narrow and the larger one is very loose, a size which the diameter of the hole could have that best fits the requirements is: C. 7/8 inch.

In Mathematics and Geometry, a measurement can be defined as an act or process through which the size, weight, magnitude, quantity, volume (capacity), dimensions, or distance traveled by a physical object or body is taken, especially for the purpose of an experiment.

Assuming small holes of 3/4 and 1 inch in diameters are made on a metal plate, and we realize that the 3/4 inch hole is very narrow and the 1 inch hole is very loose, a standard measurement and size that the diameter would be an intermediate value is given by;

3/4 = 12/16

12/16, 13/16, 14/16, 15/16, ......, 1

Required size = 14/16 = 7/8 inch.

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Complete Question:

Two holes with diameters of 3/4 inch and 1 inch, respectively, have been drilled on a metal sheet. If the smaller hole is very narrow and the larger one is very loose, what size could the diameter of the hole have that best fits the requirements?

Answer:

$63

Step-by-step explanation:

First find the cost of bananas per kilogram. To find that, divide $147 by 21

147/21=7

One kilogram of bananas costs $7

Now that you know the cost per kilogram, multiply $7 by the number of kilograms asked in the question, which in this case is 9

7*9=$63

9 kilograms of bananas costs $63

Answer: 63

Step-by-step explanation:

You can set up a proportion cost/weight=cost/weight

[tex]\frac{147}{21} = \frac{x}{9}[/tex]        Costs go on the top so x is cost for 9 kg

[tex]x=\frac{147*9}{21}[/tex]

x=63

Answer:

√(c+9)² =√64

c+9 =8

c=8-9

c=-1

The composition of function is g ( x ) f ( x ) = 5x⁴ - 40x

Given data ,

Let the first function be g ( x ) = x³ - 8

Let the second function be h ( x ) = 5x

So, the composition of functions , g(x) x h(x) would be:

(x³ - 8) (5x)

We can distribute the multiplication to get:

5x ( x³ ) - 5x ( 8 )

On simplifying , we get

A = 5x⁴ - 40x

Hence , the result of the operation g(x) x h(x) is 5x⁴ - 40x

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