Adjusted Gross Income. Use the following information for Exercises 110–113. The population mean adjusted gross income for instructors at a certain college is with standard deviation . Here is the normal probability plot for the population of instructors.
Normal probability plot of adjusted gross income.
Question 7.111
111. If possible, find the probability that a random sample of instructors will have a mean adjusted gross income between $40,000 and $60,000. If not possible, explain why not.
7.1.111
Not possible. The variable is not normally distributed and the sample size is less than 30.