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

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 101 miles per hour (mph) and the standard deviation of the serve speeds was 11 mph. If
Nothing is known about the shape of the distribution, give an interval that will contain the speeds
Of at least eight-ninths of the playerʹs serves.

A) 79 mph to 123 mph
B) 68 mph to 134 mph
C) 134 mph to 167 mph
D) 57 mph to 145 mph

Correct Answer:

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