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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

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 ...