The duration of long-distance calls made by 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 -lasts...

The duration of long-distance calls made by 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

-lasts between 5 and 10 minutes

-lasts more than 7 minutes

-lasts less than 4 minutes

- How long do the longest 10% of the calls last?