Use Normal Distribution to solve problems 5 5. The long-distance calls made by the employees of a company are normally distributed with a mean of 6.3 minutes and a standard deviation of 2.2 minutes....

Use Normal Distribution to solve problems 5

5. The long-distance calls made by the employees of a company are normally distributed

with a mean of 6.3 minutes and a standard deviation of 2.2 minutes. Find the

probability that a call

a) lasts less than 4 minutes

b) lasts between 5 and 10 minutes
c) lasts more than 7 minutes