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 100 miles per hour (mph) and the standard deviation of the serve speeds was 15 mph. Using
The z-score approach for detecting outliers, which of the following serve speeds would represent
Outliers in the distribution of the playerʹs serve speeds?
Speeds: 50 mph, 80 mph, and 105 mph

A) 50, 80, and 105 are all outliers.
B) 50 and 80 are both outliers, 105 is not.
C) 50 is the only outlier.
D) None of the three speeds are outliers.