Suppose That a Phone Company Reports That the Average Duration $1.4\sqrt{60} = .181$

Short Answer

Suppose that a phone company reports that the average duration of a cell phone call is 1.7 minutes, with a standard deviation of 1.4 minutes.
-Draw a well-labeled sketch to "The CLT says the sampling distribution of the sample mean call duration will be approximately normal, with mean 1.7 minutes and standard deviation $1.4\sqrt{60} = .181$ ".