CD players are normally distributed with a mean of 7.1 years and a standard deviation of 1.4 years
(a) Find the probability that a randomly selected CD player will have a replacement time of less than 8.0 years.
(b) Find the probability that a randomly selected CD player will have a replacement time of more than 9.0 years.
(c) Find the probability that a randomly selected CD player will have a replacement time between 5 and 8 years.