Business Weekly conducted a survey of graduates from 30 top MBA programs. On the basis of the survey, assume the mean annual salary for graduates 10 years after graduation is 181000 dollars. Assume the standard deviation is 31000 dollars. Suppose you take a simple random sample of 60 graduates. Find the probability that a single randomly selected policy has a mean value between 172595.6 and 196608.1 dollars. P(172595.6