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 98 miles per hour (mph) and the standard deviation of the serve speeds was 14mph. If nothing is known about the shape of the distribution, give an interval that will contain the speeds of atleast eight-ninths of the playerʹs serves.

A) 56 mph to 140 mph
B) 70 mph to 126 mph
C) 42 mph to 154 mph
D) 140 mph to 182 mph