A 2003 study found that medical students mean number of hours worked in a week is 81.7. Suppose the number of hours worked per week by medical residents is approximately normally distributed with a standard deviation of 6.9 hours. What is the probability that a randomly selected medical resident works more than 80 hours in a week? What is the probability that a randomly selected medical resident works more than 100 hours in a week? What is the probability that a randomly selected medical resident works less than 60 hours in a week?
