Question

5.4.17 Question Help The population mean and standard deviation are given below. Find the required probability and determine whether the given sample mean would be considered unusual. For a sample of n = 70, find the probability of a sample mean being greater than 220 if u = 219 and 6 = 3.5. For a sample of n = 70, the probability of a sample mean being greater than 220 if u = 219 and o = 3.5 is (Round to four decimal places as needed.) ts pur Enter your answer in the answer box and then click Check Answer. ess part ess Check Answer remaining Clear All ibrary here to search

Answer 1

1) Given: = O= 219 3.5 and n = 70 When, I = 220 K-= 2.39 p(F > 220 )=P(2> 2.39 ) = P(Z < -2.39 )= 0.0084 By standard normal table (negative values) The probability is 0.0084<0.05, which is unusual

2) Ag = 1 = 78 ਹ, ਫ =125 78-1.25 78 78+1.25