At the US Open Tennis Championship a Statistician Keeps Track of Every

Multiple Choice

At the U.S. Open Tennis Championship a statistician keeps track of every serve that a player hits during the tournament. The statistician reported that the mean serve speed of a particular player
Was 99 miles per hour (mph) and the standard deviation of the serve speeds was 14 mph. Assume
That the statistician also gave us the information that the distribution of the serve speeds was
Mound-shaped and symmetric. What proportion of the playerʹs serves was between 113 mph and
141 mph?

A) 0.317
B) 0.1585
C) 0.997
D) 141