At a Tennis Tournament a Statistician Keeps Track of Every

Multiple Choice

At a tennis tournament a statistician keeps track of every serve. The statistician reported that the mean servespeed of a particular player was 104 miles per hour (mph) and the standard deviation of the serve speeds was 8mph. Assume that the statistician also gave us the information that the distribution of the serve speeds was bellshaped. What proportion of the playerʹs serves are expected to be between 112 mph and 120 mph?

A) 0.1350
B) 0.270
C) 0.95
D) 0.68