Business Weekly conducted a survey of graduates from several top MBA programs. On the basis of the survey, assume the mean annual salary for graduates 10 years after graduation is $158,000. Assume the standard deviation is $32,000. Suppose you take a simple random sample of 19 graduates. Round all answers to four decimal places if necessary 1.What is the standard deviation of distribution of X?
2.What is the standard deviation of ¯¯¯X?
3.For a single randomly selected graduate, find the probability that her salary is between $151,188 and $159,159.
4.For a simple random sample of 19 graduates, find the probability that the average salary is between $151,188 and $159,159.
For part d), is the assumption of normal necessary