While the average starting salary for graduates with an MBA degree varies depending on the university attended and field of emphasis, one source shows a 2015 median annual starting base salary of $100,000

(source: Claire Zillman, “Congrats, MBA grads! You’re getting a $45,000 raise,” http://fortune.com, May 19, 2015). Assuming that starting salaries are normally distributed and the standard deviation is $20,000, what is the probability that a random sample of 100 MBA graduates will have a mean starting salary of $96,000 or less?