The speeds of the fastballs thrown by major league baseball pitchers were measured by radar gun. The mean speed was 87 miles per hour. The standard deviation of the speeds was 5 mph. Which of
The following speeds would be classified as an outlier?
A)103 mph
B)77 mph
C)82 mph
D)95 mph

Question

Quizplus · Accepted Answer

A speed of 103 mph would be classified as an outlier because it is more than 3 standard deviations away from the mean (87 mph + 3*5 mph = 102 mph). Anything beyond this range is considered an outlier.

The Speeds of the Fastballs Thrown by Major League Baseball