How is wind speed related to the time of day?

Time of Day Wind Speed (mph)
12:00 (noon) 10
1:30 P.M. 0
4:00 P.M. 15
6:30 P.M. 5
7:30 P.M. 0
a. The later in the day, the faster the wind speed.
b. The earlier in the day, the faster the wind speed.
c. Wind speed is consistent throughout the day.
d. no relationship

Answer:

∠ PQR = 18°

Step-by-step explanation:

the exterior angle of a triangle is equal to the sum of the 2 opposite interior angles.

∠ PQR is an exterior angle of the triangle , then

∠ PQR = ∠OPQ + ∠ QOP , that is

4x - 10 = x + 9 + x - 5

4x - 10 = 2x + 4 ( subtract 2x from both sides )

2x - 10 = 4 ( add 10 to both sides )

2x = 14 ( divide both sides by 2 )

x = 7

Then

∠ PQR = 4x - 10 = 4(7) - 10 = 28 - 10 = 18°

We know that the volume of a cube is given by V = s^3, where s is the length of a side. Taking the derivative of both sides with respect to time, we get:

dV/dt = 3s^2 ds/dt

We are given that dV/dt = 77 cubic feet per second and V = 8 cubic feet. Therefore,

77 = 3s^2 ds/dt
ds/dt = 77/(3s^2)

We also know that the surface area of a cube is given by A = 6s^2. Taking the derivative of both sides with respect to time, we get:

dA/dt = 12s ds/dt

Substituting ds/dt from above, we get:

dA/dt = 12s (77/(3s^2))
dA/dt = 308/s

At the instant when the volume of the cube is 8 cubic feet, s = (8)^(1/3) = 2, since s is the length of a side. Therefore,

dA/dt = 308/2 = 154

So the rate of change of the surface area of the cube is 154 square feet per second.
To solve this problem, we will use the given information about the rate of change of volume and relate it to the rate of change of surface area. First, let's express the volume (V) and surface area (A) of a cube in terms of its side length (s):

1. Volume of a cube: V = s³
2. Surface area of a cube: A = 6s²

Now, differentiate both equations with respect to time (t):

1. dV/dt = 3s² ds/dt
2. dA/dt = 12s ds/dt

We are given that dV/dt = 77 cubic feet per second. We need to find dA/dt when the volume is 8 cubic feet.

From the volume equation (V = s³), we can find the side length (s) when the volume is 8 cubic feet:

8 = s³
s = 2 feet (since 2³ = 8)

Now, we can find ds/dt by plugging in the values for s and dV/dt into the first differentiated equation:

77 = 3(2²) ds/dt
77 = 12 ds/dt
ds/dt = 77/12 feet per second

Now that we have ds/dt, we can find dA/dt by plugging in the values for s and ds/dt into the second differentiated equation:

dA/dt = 12(2)(77/12)
dA/dt = 24(77/12)
dA/dt = 154 square feet per second

So, the rate of change of the surface area of the cube is approximately 154 square feet per second when the volume is 8 cubic feet.

Learn more about the surface area here:- brainly.com/question/29298005.

#SPJ11

The simplified expression for the cost of renting the apartment for n months is 900n + 1350.

We have,

To simplify the expression 900(n + 1) + 450, we can start by using the distributive property of multiplication over addition, which states that:

a(b + c) = ab + ac.

So, we have:

900(n + 1) + 450

= 900n + 900(1) + 450 (applying the distributive property)

= 900n + 900 + 450

= 900n + 1350

Therefore,

The simplified expression for the cost of renting the apartment for n months is 900n + 1350.

Learn more about expressions here:

https://brainly.com/question/3118662

#SPJ1

The correct statement regarding the end behavior of the graph is given as follows:

C. As x approaches positive infinity, D(x) approaches negative infinity.

The end behavior of a function is given by the limit of the function is the input x goes to either negative infinity or positive infinity.

For this problem, the function is a quadratic function with negative leading coefficient, meaning that it will approach negative infinity when x approaches negative infinity and when x approaches positive infinity.

This means that the correct option is given by option C.

More can be learned about the end behavior of a function at brainly.com/question/1365136

#SPJ1

The change in temperature of the charcoal from 180°F to 60°F is equal to a decrease of approximately 2.2 degrees Celsius.

To convert Fahrenheit to Celsius, we can use the formula:

Celsius = (Fahrenheit - 32) × 5/9

We know that the initial temperature of the charcoal was 180°F, and it experienced a temperature drop of 120°F. To find the final temperature in Fahrenheit, we can subtract 120°F from 180°F:

Final temperature in Fahrenheit = 180°F - 120°F = 60°F

Now, we can convert the final temperature from Fahrenheit to Celsius using the formula above:

Celsius = (60°F - 32) × 5/9

Celsius = (28°F) × 5/9

Celsius = -2.2222...

Rounding the result to one decimal place, we get:

Celsius = -2.2 degrees Celsius (approx.)

It's worth noting that the Celsius scale is based on the metric system, which is the standard measurement system used in most countries worldwide. In contrast, the Fahrenheit scale is primarily used in the United States and a few other countries, making it less universal. Understanding how to convert between the two scales is crucial in various scientific, engineering, and technical fields.

To learn more about temperature

https://brainly.com/question/7510619

#SPJ4

Complete question:

A piece of charcoal that was initially at 180°F experiences a temperature drop of 120°F. Express this change of temperature in Celsius degrees.

Using the given information, the area of R is 6 times bigger than the area of Q

From the question, we are to determine how many times bigger the area of R is than the area of Q

From the given information,

Q is 1/4 of a circle of radius 10 cm

The area of a circle is given by the formula,

Area = πr²

Where r is the radius

Thus,

Area of Q = 1/4 πr²

Area of Q = 1/4 × π × (10)²

Area of Q = 1/4 × π × 100

Area of Q = 25π cm²

Also,

From the given information,

R is the 2/3 of a circle of radius 15cm

Thus,

Area of R = 2/3 πr²

Area of R = 2/3 × π × (15)²

Area of R = 2/3 × π × 225

Area of R = 450/3 π cm²

Area of R = 150 π cm²

To determine how many times bigger the area of R is than the area of Q, we will divide the area of R by the area of Q

That is,

150 π cm² /  25π cm²

= 6

Hence,

Area R is 6 times bigger than area Q

Learn more on Calculating the area of a circle here: https://brainly.com/question/14068861

#SPJ1

To answer your question involving independent events, algebra, and Kolmogorov's zero-one law. That to prove that if B ∈ T, then P(B) is either 0 or 1,

Follow these steps:

1. Define An as a sequence of independent events and T as the tail σ-algebra generated by the events An, An+1, ...

2. Introduce the concept of a tail event: A tail event is an event B such that B belongs to the tail σ-algebra T.

3. Apply Kolmogorov's zero-one law: This law states that for any tail event B belonging to T, the probability of B is either 0 or 1.

Proof:

Step 1: Given An as a sequence of independent events, let T be the tail σ-algebra generated by the events An, An+1, ...

Step 2: Let B be a tail event such that B ∈ T.

Step 3: By Kolmogorov's zero-one law, for any tail event B ∈ T, the probability of B is either 0 or 1.

Therefore, if B ∈ T, then P(B) is either 0 or 1.

Learn more about independent events: https://brainly.com/question/27665211

#SPJ11

The probability of selling at least 4 or 5 units in the first week is 0.25 or 25%.

The probability of selling at least 4 or 5 units in the first week is equal to the sum of the probabilities of selling 4 and 5 units, which is:

P(4 or 5) = P(4) + P(5) = 0.15 + 0.10 = 0.25

Probability is a branch of mathematics that deals with the study of random events or experiments. It is used to quantify the likelihood of an event occurring by assigning a number between 0 and 1, with 0 indicating that the event is impossible and 1 indicating that the event is certain to happen.

Therefore, the probability of selling at least 4 or 5 units in the first week is 0.25 or 25%.

To know more about probability here

https://brainly.com/question/23286309

#SPJ4

The value of the perimeter of the given isosceles triangle with a vertex at B will be 40 units.

We have,

A triangle is a 3-sided shape that is occasionally referred to as a triangle. There are three sides and three angles in every triangle, some of which may be the same.

The sum of all three angles inside a triangle will be 180° and the area of a triangle is given as (1/2) × base × height.

As per the given isosceles triangle with vertices, ABC is drawn below.

Since B is the vertex thus BA = BC

6x + 3 = 8x - 1

2x = 4

x = 2

So, AB = 6(2) + 3 = 15

BC = 8(2) - 1 = 15

AC = 10(2) - 10 = 10

Perimeter = 15 + 15 + 10 = 40 units.

Hence "The value of the perimeter of the given isosceles triangle with a vertex at B will be 40 units".

For more about triangles,

brainly.com/question/2773823

#SPJ1

complete question:

Triangle ABC is an isosceles triangle with angle B as the vertex angle. Find the perimeter if AB = 6x + 3, BC = 8x - 1, and AC = 10x - 10. Perimeter = ______ units

The probability of a sample of 144 producing a mean of 50 or larger if the population has a mean of 49 and a standard deviation of 5 is approximately 0.0082 or 0.82%.

To solve this problem, we can use the central limit theorem, which states that the distribution of sample means approaches a normal distribution as the sample size increases, regardless of the shape of the population distribution.

First, we need to calculate the standard error of the mean (SEM) using the formula:

Point W has the polar coordinates negative five comma two pi over 3.

We have to given that;

To find the coordinate for the point (- 5, 2π/3).

Now, We can formulate;

Coordinates of W = (- 5, 2π/3).

Thus, The correct point which shows the polar coordinates negative five comma two pi over 3 is,

⇒ Point W

Therefore, Point W has the polar coordinates negative five comma two pi over 3.

Learn more about the coordinate visit:

https://brainly.com/question/24394007

#SPJ1

The evaluation gives 8.

Quotient is division of two given integers; which is expressed as a fraction. It can be expressed in the form of either proper fraction or improper fraction.

Considering the given question, we have;

quotient of 25 and 5 = 25/ 5

Then increased by 3, we have;

25/5 + 3

find the LCM of the expression

25/5 + 3 = (25 + 15)/5

              = 40/5

              = 8

Therefore on evaluation, the final answer is 8.

Learn more about quotient at https://brainly.com/question/11418015

#SPJ1

Amount of butter that Pam needs is 300 g.

Given ingredients to make 10 cookies.

Ingredients needed for 10 cookies is,

Butter : 120 g

Sugar : 75 g

Plain flour : 180 g

Chocolate chips : 150 g

Eggs : 2

The proportion of each ingredient will be same.

To make 25 cookies,

Amount needed = 25 / 10 = 2.5

Amount of butter needed = 2.5 × 120 = 300 g

Hence the amount of butter needed is 300 g.

Learn more about Proportions here :

https://brainly.com/question/14279414

#SPJ1

(a) the probability that the daily revenue exceeds $5,000 is approximately 0.1587.

(b) E(P) = E(N(10 - C)) = E(10N) - E(NC) = 4000 - E(N)E(C) + Cov(N, C)

= 4000 - 400*1000 + 12000 = -120000

(c) The expected daily profit is -$120,000.

(d) the variance of the daily profit is $56,250,000,000.

What is probability?

Probability is a measure of the likelihood of an event occurring. It is expressed as a number between 0 and 1, where 0 indicates that the event is impossible and 1 indicates that the event is certain.

(a) Let X be the daily revenue. Then X = 10N, and we have:

E(X) = E(10N) = 10E(N) = 10(400) = 4000

[tex]Var(X) = Var(10N) = 10^2Var(N) = 10^2(50^2) = 25000[/tex]

Using the standardization formula, we have:

[tex]P(X > 5000) = P(Z > (5000-4000)/\sqrt(25000)) = P(Z > 1)[/tex]

Using a standard normal table or calculator, we find P(Z > 1) = 0.1587.

Therefore, the probability that the daily revenue exceeds $5,000 is approximately 0.1587.

(b) The total daily profit is given by:

P = N(10 - C)

Using the formula for the covariance between N and C, we have:

Cov(N, C) = rhosigma(N)sigma(C) = 0.850300 = 12000

Then we have:

E(P) = E(N(10 - C)) = E(10N) - E(NC) = 4000 - E(N)E(C) + Cov(N, C)

= 4000 - 400*1000 + 12000 = -120000

(c) The expected daily profit is -$120,000.

(d) To compute the variance of P, we use the formula:

Var(P) = Var(N(10 - C)) = 100Var(N)Var(10 - C) + 210Cov(N, 10 - C) + Var(10 - C)Var(N)

We have already computed Var(N) and Cov(N, 10 - C) in part (a) and (b). Also, we have:

Var(10 - C) = Var(10) + Var(C) - 2Cov(10, C) = 0 + 300^2 - 2(0) = 90000

Plugging in the values, we get:

Var(P) = 100(25000)(90000) + 2(10)(12000) + 90000(25000)

= 56250000000

Therefore, the variance of the daily profit is $56,250,000,000.

To learn more about probability visit:

https://brainly.com/question/23417919

#SPJ4

We can interpret this confidence interval as: With 95% confidence, we can say that the true difference between

a) Hypothesis test for comparing variances between two data sets:

Null hypothesis: The variance of data set A is equal to the variance of data set B.

Alternative hypothesis: The variance of data set A is not equal to the variance of data set B.

We can use the F-test to compare the variances between the two data sets. The test statistic is calculated as:

[tex]F = s1^2 / s2^2[/tex]

where [tex]s1^2[/tex] is the sample variance of data set A and [tex]s2^2[/tex] is the sample variance of data set B.

Using the given information, we can calculate the test statistic as:

F = 0.45 / 0.32 = 1.41

Using an alpha level of 0.05 and degrees of freedom of 28 and 21 (n1-1 and n2-1), we can find the critical values for F as 0.46 and 2.33.

Since the calculated F value of 1.41 falls between the critical values, we fail to reject the null hypothesis and conclude that there is not enough evidence to suggest that the variance of data set A is different from the variance of data set B.

b) Hypothesis test for comparing means between two data sets:

Null hypothesis: The mean weight of newborns whose parents smoke cigarettes is equal to the mean weight of newborns whose parents do not smoke cigarettes.

Alternative hypothesis: The mean weight of newborns whose parents smoke cigarettes is not equal to the mean weight of newborns whose parents do not smoke cigarettes.

Since the variances of the two data sets are not significantly different from each other, we can use a two-sample t-test assuming equal variances to compare the means between the two data sets.

Using the given information, we can calculate the test statistic as:

t = (x1bar - x2bar) / (sqrt[([tex]s^2[/tex] / n1) + ([tex]s^2[/tex] / n2)])

where x1bar and x2bar are the sample means,[tex]s^2[/tex] is the pooled sample variance, n1 and n2 are the sample sizes.

Using an alpha level of 0.05 and degrees of freedom of 48 (n1 + n2 - 2), we can find the critical values for t as ±2.01.

Using the given information, we can calculate the test statistic as:

t = (7.25 - 7.68) / (sqrt[(0.[tex]385^2[/tex] / 30) + ([tex]0.28^2[/tex] / 23)]) = -1.2

Since the calculated t value of -1.23 falls between the critical values, we fail to reject the null hypothesis and conclude that there is not enough evidence to suggest that the mean weight of newborns whose parents smoke cigarettes is different from the mean weight of newborns whose parents do not smoke cigarettes.

c) Confidence interval for the difference between means:

Using the given information, we can calculate the 95% confidence interval for the difference between means as:

(x1bar - x2bar) ± tα/2,df * (sqrt[([tex]s^2 / n1[/tex]) + (s^2 / n2)])

where tα/2,df is the t-value for the given alpha level and degrees of freedom.

Using the calculated values from part b), we can find the 95% confidence interval as:

(7.25 - 7.68) ± 2.01 * (sqrt[(0.385^2 / 30) + ([tex]0.28^2[/tex] / 23)]) = (-0.779, 0.179)

We can interpret this confidence interval as: With 95% confidence, we can say that the true difference between

To learn more about  confidence visit:

https://brainly.com/question/28969535

#SPJ11

Answer:

8384742

Step-by-step explanation:

Answer:

there is no cow there because they have been barn

a) the probability that a household views television between 5 and 12 hours a day is approximately 0.7357.

b)a household must view approximately 13.70 hours of television per day to be in the top 3% of all television viewing households.

c) the probability that a household views television more than 4 hours a day is approximately 0.9599.

(a) We need to find the probability that a household views television between 5 and 12 hours a day. Let X be the random variable representing daily television viewing per household. Then, we need to find P(5 < X < 12). Using the standard normal distribution table or a calculator with normal distribution functions, we can compute:

z1 = (5 - 8.35) / 2.5 = -1.34

z2 = (12 - 8.35) / 2.5 = 1.46

P(-1.34 < Z < 1.46) ≈ 0.7357

Therefore, the probability that a household views television between 5 and 12 hours a day is approximately 0.7357.

(b) We need to find the value of X such that the probability of a household viewing more than X hours of television per day is 0.03. Using a standard normal distribution table or a calculator with inverse normal distribution functions, we can compute:

z = InvNorm(0.97) ≈ 1.88

z = (X - 8.35) / 2.5

X = 2.5z + 8.35 ≈ 13.70

Therefore, a household must view approximately 13.70 hours of television per day to be in the top 3% of all television viewing households.

(c) We need to find the probability that a household views television more than 4 hours a day. Using the standard normal distribution table or a calculator with normal distribution functions, we can compute:

z = (4 - 8.35) / 2.5 = -1.74

P(Z > -1.74) ≈ 0.9599

Therefore, the probability that a household views television more than 4 hours a day is approximately 0.9599.

To learn more about distribution visit:

https://brainly.com/question/29062095

#SPJ11

(a)There's solid prove to demonstrate that the standard deviation of gap breadth surpasses 0.01 millimeters. (b) Employing a control calculator or computer program, ready to decide that a test measure of roughly 44 is required to realize a control of at slightest 0.8 to detect a 50% increment in standard deviation at a centrality level of 0.1. (c) Assuming the same noteworthiness level of 0.1, ready to utilize a control calculator or program to discover that a test measure of around 22 is required to attain a control of at slightest 0.8.

(a) To test in case the standard deviation of gap distance across surpasses 0.01 millimeters, we are able utilize a one-tailed t-test with a noteworthiness level of 0.1. The invalid speculation is that the standard deviation is less than or rise to to 0.01 millimeters, and the elective theory is that the standard deviation is more noteworthy than 0.01 millimeters. We expect that the basic dispersion of the gap breadths is around ordinary.

Utilizing the equation for the t-test, we get:

[tex]t = (s / \sqrt{} (n-1)) / (0.01)[/tex]

[tex]t = (0.008 / \sqrt{} (14)) / (0.01)[/tex]

t = 2.26

The degrees of opportunity for this test is n-1 = 14. From a t-distribution table, we discover that the p-value for a one-tailed test with 14 degrees of opportunity and t=2.26 is roughly 0.021. Since the p-value is less than the noteworthiness level of 0.1, we dismiss the invalid speculation.

(b) To discover the likelihood that the test in part (a) will identify a 50% increment in standard deviation, we have to be calculate the control of the test. The control of a test is the likelihood of dismissing the invalid theory when the elective theory is genuine.

The control of the test depends on a few components, counting the test measure, the noteworthiness level, and the impact measure. In this case, the effect size is the contrast between the actual standard deviation and the hypothesized esteem, communicated in standard deviation units.

(c) If the real standard deviation is 0.0125 millimeters and we need to distinguish this with a control of at least 0.8, we ought to decide the test measure required for the test. Assuming the same noteworthiness level of 0.1, ready to utilize a control calculator or program to discover that a test measure of around 22 is required to attain a control of at slightest 0.8.

We have utilized a one-tailed t-test to decide that there's solid prove to show that the standard deviation of gap breadth surpasses 0.01 millimeters. We have too calculated the control of the test to distinguish a 50% increment in standard deviation and the test measure required to distinguish a standard deviation of 0.0125 millimeters with a control of at slightest 0.8.

Learn more about distance here:

https://brainly.com/question/15172156

#SPJ4

The price at which the video game should be sold to maximize profit is $19.40 (to the nearest cent).

We have,

To find the price at which the video game should be sold to maximize profit, we need to find the x-value that corresponds to the maximum value of y.

The equation that relates profit to selling price is:

y = -5x^2 + 194x - 990

To find the x-value that maximizes profit, we need to find the vertex of the parabolic graph represented by this equation.

The x-coordinate of the vertex is given by:

x = -b/2a

where a is the coefficient of the x^2 term, and b is the coefficient of the x term.

In this case,

a = -5 and b = 194, so:

x = -194/(2 (-5)) = 19.4

Thus,

The price at which the video game should be sold to maximize profit is $19.40 (to the nearest cent).

Learn more about equations here:

https://brainly.com/question/27399875

#SPJ1

The total volume of the object is 96 m^3.

A cuboid is a three dimensional shape that is formed from a rectangle. Thus its dimensions are: length, width and height.

The volume of a cuboid = length x width x height

Considering the object given in the diagram, divide it into two rectangular prisms. So that;

i. volume of rectangular prism 1 = length x width x height

                                    = 5 x 3 x 4

                                    = 60

The volume of rectangular prism 1 is 60 cubic meters.

ii. volume of rectangular prism 2 = length x width x height

                                    = 4x 3 x 3

                                    = 36

The volume of rectangular prism 2 is 36 cubic meters.

Thus,

total volume of the object = 60 + 36

                                           = 96

The total volume of the object is 96 m^3.

Learn more about the volume of a cuboid at https://brainly.com/question/30389460

#SPJ1

The area of the sector to the nearest hundredth is 308.57units²

The space bounded by two radii and an arc is called a sector of a circle. There is minor sector and major sector.

The area of a sector is expressed as;

A = tetha/360 × πr²

where r is the radius and tetha is the angle formed by the two radii.

A = 98/369 × 3.14 × 19²

A = 111086.92/360

A = 308.57 units²( nearest hundredth)

therefore the area of the sector is 308.57 units²

learn more about area of sector from

https://brainly.com/question/22972014

#SPJ1

The  ratio of the volume of the cone to the volume of the cylinder is approximately 0.33 : 1 (rounded to the nearest hundredth).

The volume of the cone can be calculated using the formula:

V = (1/3)πr^2h

where r is the radius of the cone and h is the height of the cone. Substituting the given values, we get:

V = (1/3)π(3)^2(11) = 103.67 cubic feet

Therefore, the volume of the cone is 103.67 cubic feet (rounded to the nearest hundredth).

To find the radius of the cylinder, we can use the formula for the volume of a cylinder:

V = πr^2h

where r is the radius of the cylinder and h is the height of the cylinder. We are given that the volume of the cylinder is 310.86 cubic feet and that the height is 11 feet, so we can solve for r:

310.86 = πr^2(11)
r^2 = 310.86 / (11π)
r ≈ 2.3 feet

Therefore, the radius of the cylinder is approximately 2.3 feet (rounded to the nearest hundredth).

The ratio of the volume of the cone to the volume of the cylinder is the volume of the cone divided by the volume of the cylinder. Using the values we calculated, we get:

V(cone) / V(cylinder) = 103.67 / 310.86 ≈ 0.33 : 1

Therefore, the ratio of the volume of the cone to the volume of the cylinder is approximately 0.33 : 1 (rounded to the nearest hundredth).

Visit to know more about Ratio:-

brainly.com/question/12024093

#SPJ11

Answer:x= -9/2 which is -4.5

Step-by-step explanation:

8(x+5)=4

first divide by 8

(x+5)=4/8

simplify

(x+5)=1/2

subtract 5

x=1/2-5

change 5 to have a denominator of 2

5 x 2/2

=10/2

x= 1/2-10/2

=-9/2

The requried, system of equations is y = 2x + 10 and y = 4.50x.

Let's use the variables x and y to represent the number of movies rented and the total cost, respectively. Then, the two plans can be represented by the following equations:

For Netflix members:

y = 2x + 10

For non-members:

y = 4.50x

In the first equation, the $10 represents the flat fee that is charged regardless of how many movies are rented, and the $2x represents the additional cost based on the number of movies rented.

In the second equation, the $4.50x represents the cost per movie for non-members.

Learn more about the system of equations here:

https://brainly.com/question/24065247

#SPJ1

The total volume of ice cream in term of π is 42π³

The volume of an object is the amount of space occupied by the object or shape, which is in three-dimensional space.

The total volume of the ice cream = volume of cone + volume of half sphere

volume of a cone = 1/3 πr²h

= 1/3 × π × 3² × 8

= π×3 ×8

= 24π in³

volume of the half sphere = 4/6πr³

= 4/6 ×π × 3³

= 108π/6

= 18π in³

therefore the total volume of the ice cream

= 24π + 18π

= 42π in³

learn more about volume of shapes from

https://brainly.com/question/31511971

#SPJ1

The population mean is not equal to 72 at a 10% significance level.

a) The standard error of the mean is given by the formula:

SE = σ/√n

where σ is the population standard deviation, n is the sample size. Since the population standard deviation is not known, we use the sample standard deviation as an estimate. Therefore,

SE = s/√n = 1.3/√76 ≈ 0.149

b) We need to find the critical value of t* with 75 degrees of freedom (df = n-1) and a 90% confidence level. Using a t-table or calculator, we find that the critical value is approximately t* = ±1.663.

c) To construct the 90% confidence interval, we use the formula:

CI = X ± t*(SE)

where X is the sample mean, t* is the critical value, and SE is the standard error of the mean. Substituting the values, we get:

CI = 77 ± 1.663(0.149) = (76.739, 77.261)

Therefore, we are 90% confident that the true population mean μ lies within the interval (76.739, 77.261).

d) To test the hypothesis at α=0.100, we compare the confidence interval with the null hypothesis. If the null hypothesis falls outside the confidence interval, we reject it at the given level of significance.

Since 72 is not within the confidence interval of (76.739, 77.261), we can reject the null hypothesis at α=0.100. This means we have sufficient evidence to conclude that the population mean is not equal to 72 at a 10% significance level.

To learn more about confidence visit:

https://brainly.com/question/29048041

#SPJ11

There are 22,269,952 different 9-card hands that contain four cards of the same value in a standard deck of playing cards.

To determine how many 9-card hands contain four cards of the same value, we will use the following terms: standard deck of playing cards, 52 different cards, 13 different values, 4 different suits, 2 red suits, 2 black suits, and a hand of cards.

Your answer:

1. Choose the value of the four cards: There are 13 different values, so there are 13 ways to choose the value of the four cards.
2. Choose the four cards of the same value: For each value, there are 4 different suits, so there are 4C4 = 1 way to choose the four cards of the same value.
3. Choose the remaining 5 cards: We have already selected 4 cards, so there are 48 cards left in the deck (52 - 4 = 48). We need to choose 5 cards from these remaining 48 cards. There are 48C5 ways to do this.
4. Subtract the hands with five cards of the same value: Since we don't want hands with five cards of the same value, we need to subtract these cases. There are 13 different values, so there are 13 ways to choose the value of the five cards. For each value, there are 4 different suits, so there are 4C5 = 0 ways to choose the five cards of the same value (since it's not possible to choose 5 cards from 4).
5. Calculate the total number of 9-card hands: Multiply the number of ways to choose the value, the four cards of the same value, and the remaining 5 cards, then subtract the hands with five cards of the same value: (13 x 1 x 48C5) - (13 x 0) = 13 x 1,712,304 = 22,269,952.

So, there are 22,269,952 different 9-card hands that contain four cards of the same value in a standard deck of playing cards.

To learn more about cards

https://brainly.com/question/29243805

#SPJ11

The total price Donte paid for the computer was $155.52.

The regular price of the computer was $180.

Donte got a 20% discount, which means he paid 100% - 20% = 80% of the regular price.

So, Donte paid 80% of $180, which is

(80/100) x $180 = $144.

Next, an 8% sales tax was added to the cost of the computer.

The amount of tax is

(8/100) x $144 = $11.52

Therefore, the total price Donte paid for the computer was

$144 + $11.52 = $155.52.

sales tax is a consumption tax imposed by the government on the sale of goods and services. A conventional sales tax is levied at the point of sale, collected by the retailer, and passed on to the government.

Sales tax is always a percentage of a product's value which is charged at the point of exchange or buy and is indirect.

To know more about sales tax visit:

https://brainly.com/question/29442509

#SPJ4