The Lengths of Long Distance Phone Calls Placed on a Cell

question 20

Multiple Choice

The lengths of long distance phone calls placed on a cell phone can be described by a Normal model with a mean of 7 minutes and a standard deviation of 2 minutes.If one call is randomly selected from wireless phone company records,what is the probability that it will have lasted more than 11 minutes?

• A)0.0977
• B)0.23
• C)0.977
• D)0.023
• E)0.98