
If the mean is 9.25 and the standard deviation is 2.05 then how would I solve this? It's asking for me to find the value of A for which P(x<a)=0.2

If the mean is 9.25 and the standard deviation is 2.05 then how would I solve...
Assume that z-scores are normally distributed with a mean of O and a standard deviation of 1. If P(0 < z < a) = 0.4857, find a. a = (Round to two decimal places.)
A population has a mean μ-85 and a standard deviation σ-21. Find the mean and standard deviation of a sampling distribution of sample means with sample size n 49 H(Simplity your answer) o-# L] (Simplify your answer.) to the random variable x is normally distributed with mean-83 and standard deviation ơ-4 Find the indicated probability P(70sx 76) P(70 < x < 76)= Round to four decimal places as needed.) Enter your answer in the answer box
Test the hypothesis using the P-value approach. Be sure to verify the requirements of the test. Ho: p = 0.65 versus H : p<0.65 n= 150, x= 87, a = 0.01 Is npo (1-po) 2 10? Ο Νο Yes Use technology to find the P-value. P-value = (Round to three decimal places as needed.)
Ha:μ<85 A sample of 140 is used and the population standard deviation is 10, Compute the p-value and state your conclusion for each of the following sample results. Use a-0.01 Round z value to two decimal places and p-value to four decimal places. If your answer is zero, enter "O". Enter negative value as negative number a. 82.5 z value p-value conclusion reject b.82 Ho z value p-value conclusion reject Ho C.80 z value p-value conclusion reject d. 86.5 Ho...
X is a normally distributed variable with mean p = 30 and standard deviation o = 4. Find P(x < 40)
CI Assume the random variable x is normally distributed with mean probability 89 and standard deviation ơ 4 Find the indicated Px 83) P(x < 83) (Round to four decimal places as needed.) Enter your answer in the answer box imal p O Type here to search 图自3 e )
5. Use the Standard Normal Distribution table to find P (Z<-0.69)
One characteristic measured about high schools is the percent
free lunch, which is the percentage of the student body that is
eligible for free and reduced-price lunches. The top 100 schools,
grouped according to their percent free lunch, is as follows.
Percent free
lunch (x)
Number of top
100
ranked high schools
46
20
12
10
12
If stratified random sampling with proportional allocation is
used to select a sample of 25 high schools, how many would be
selected...
Consider the following hypotheses. Hop<0.19 Hy:p> 0.19 Given that p = 0.2, n = 130, and a = 0.01, answer the following questions. a. What conclusion should be drawn? b. Determine the p-value for this test. a. Determine the critical value(s) of the test statistic. Za (Use a comma to separate answers as needed. Round to two decimal places
prioe in a certain year was $108.53. Assume the population standard deviation is $22.00 and that a random sample of 37 hotels was selected. Completo parts a through d below. a. Calculate the standard error of the mean. Round to two decimal places as needed.) b. What is the probability that the sample mean will be less than $1112 P(x<$111) Round to four decimal places as needed.) c. What is the probability that the sample mean will be more than...