1. The time it takes to train a newly hired telephone sales representative is normally distributed with a mean of 136 hours and a standard deviation of 8.9 hours. What is the probability that training for a given individual will last between 130 and 140 hours?
2. At a city high school, past records indicate that the MSAT scores of students have a mean of 510 and a standard deviation of 90. One hundred students in the high school are to take the test. What is the probability that the sample mean score will be
(a) more than 530?
(b) less than 500?
(c) between 495 and 515?