I need help please and thank you

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Answer 1

Answer:

Answer:

Step-by-step explanation:

explanation in picture

Related Questions

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The mail arrival time to a department has a uniform distribution over 5 to 45 minutes. What is the probability that the mail arrival time is more than 25 minutes on a given day? Answer: (Round to 2 decimal places.)
Find the volume of a right circular cone that has a height of 3.2m and a base with a radius of 14.1m. Round your answer to nearest tenth of a cubic meter
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What is the domain of h?A) -5≤h(x)≤4
B) The h(x) values -4,-2,2,4, and 6
C) The h(x) values -5,-4,0,2, and 4
D) -4≤h(x)≤6

Answers

Answer:

Step-by-step explanation:

The domain is all the x numbers for each point
So -5,-4,0,2,4

In the past, 21% of all homes with a stay-at-home parent, the father is the stay-at-home parent. An independent research firm has been charged with conducting a sample survey to obtain more current information. (a) What sample size is needed if the research firm's goal is to estimate the current proportion of homes with a stay-at-home parent in which the father is the stay-at-home parent with a margin of error of 0.09? Use a 95% confidence level. (Round your answer up to the nearest whole number.)

Answers

Answer:

A sample size of 79 is needed.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{(\pi(1-\pi))/(n)}$

In which

z is the zscore that has a pvalue of $1 - (\alpha)/(2)$ .

For this problem, we have that:

$\pi = 0.21$

The margin of error is:

$M = z\sqrt{(\pi(1-\pi))/(n)}$

95% confidence level

So $\alpha = 0.05$ , z is the value of Z that has a pvalue of $1 - (0.05)/(2) = 0.975$ , so $Z = 1.96$ .

What sample size is needed if the research firm's goal is to estimate the current proportion of homes with a stay-at-home parent in which the father is the stay-at-home parent with a margin of error of 0.09?

A sample size of n is needed.

n is found when M = 0.09. So

$M = z\sqrt{(\pi(1-\pi))/(n)}$

$0.09 = 1.96\sqrt{(0.21*0.79)/(n)}$

$0.09√(n) = 1.96√(0.21*0.79)$

$√(n) = (1.96√(0.21*0.79))/(0.09)$

$(√(n))^(2) = ((1.96√(0.21*0.79))/(0.09))^(2)$

$n = 78.68$

Rounding up to the nearest whole number.

A sample size of 79 is needed.

You have $20 to spend on taxi fare. The ride costs $5 plus $2.50 per kilometer. Write an inequality to determine the distance in kilometers,d, you can ride for $20.

Answers

it has to be ummmm.........

Let X1, X2, and X3 represent the times necessary to perform three successive repair tasks at a service facility. Suppose they are normal random variables with means of 50 minutes, 60 minutes, and 40 minutes, respectively. The standard deviations are 15 minutes, 20 minutes, and 10 minutes, respectively. a Suppose X1, X2, and X3 are independent. All three repairs must be completed on a given object. What is the mean and variance of the total repair time for this object.

Answers

Answer:

The mean of the total repair time is 150 minutes.

The variance of the total repair time is 725 minutes^2.

Step-by-step explanation:

To solve this problem, we have to use the properties of the mean and the variance. Our random variable is the sum of 3 normal variables.

In the case, for the mean, we have that the mean of the sum of 3 normal variables is equal to the sum of the mean of the 3 variables:

$y=x_1+x_2+x_3 \n\nE(y)=E(x_1+x_2+x_3)=E(x_1)+E(x_2)+E(x_3)\n\nE(y)=50+60+40=150$

For the variance, we apply the property for the sum of independent variables (the correlation between the variables is 0):

$V(y)=V(x_1)+V(x_2)+V(x_3)\n\nV(y)=s_1^2+s_2^2+s_3^2\n\nV(y)=15^2+20^2+10^2\n\nV(y)=225+400+100\n\nV(y)=725$

What is the remainder when you divide
(2x^3– 5x – 7) by (x + 2) ?

Answers

Answer:

this is the remainder.

Final answer:

To find the remainder, use polynomial long division to divide (2x^3 - 5x - 7) by (x + 2).

Explanation:

To find the remainder when dividing (2x^3 - 5x - 7) by (x + 2), we can use polynomial long division. First, divide the first term of the numerator by the first term of the divisor to get the quotient. Multiply the divisor by the quotient and subtract it from the numerator. Repeat this process until you have subtracted all terms of the divisor from the numerator. The resulting polynomial after division will be the remainder. In this case, the remainder will be 17x - 31.

Learn more about polynomial long division here:

brainly.com/question/32236265

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Roy wants to buy a new television for $300.

Answers

Answer:

No answer...

Step-by-step explanation:

Ok so roy has 300$ and nothing else?

Answer:

Thats it?

Step-by-step explanation:

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