Question Five: Annual Salary (10 Marks) The annual salary of the new graduates of a business school is Normally distributed with a mean of $68,000 and a standard deviation of $4,000. a) What is the probability that a randomly selected graduate receives more than $70,000? b) A random sample of five graduates is selected. What is the probability that the sample mean is greater than $70,000? c) In a random sample of five graduates, what is the probability that each of them receives more than $70,000