# Probability of long distance calls

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 between 5 and 10 minutes

b. lasts more than 7 minutes

c. lasts less than 4 minutes

https://brainmass.com/statistics/probability/probability-long-distance-calls-193835

#### Solution Preview

Mean = 6.3 Minutes

Std Dev = 2.2 mins

Z = (X - mean)/ standard deviation

once you have a z value, you can look up the ...

#### Solution Summary

The probability of long distance calls are provided.

$2.19