The number of semester hours of college credit taken by CFA candidates has a distribution with a mean of 141 hours and a standard deviation of 18 hours. Consider a random sample of 100 first-time candidates for the CFA exam and let ????represent the mean number of hours of college credit taken for the sample.

a. What if ?????????

b. What is ?????????

c. Describe the shape of the sampling distribution of ????.

d. Find the z-score for the value ????= 142 hours.

e. Find ????(????> 142)