Business Weekly conducted a survey of graduates from 30 top MBA programs. Data were approximately normally distributed. On the basis of the survey, assume the mean annual salary for graduates 10 years after graduation is 152000 dollars. Assume the standard deviation is 37000 dollars. Suppose you take a simple random sample of 91 graduates. Find the probability that a single randomly selected salary is at most 157000 dollars. Answer = Find the probability that a sample of size n = 91 is randomly selected with a mean that is at most 157000 dollars. Answer = Enter your answers as numbers accurate to 4 decimal places