The U.S. Open Championship is played each year in New York and Roger Federer was one of the men’s best players. The U.S

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The U.S. Open Championship is played each year in New
York and Roger Federer was one of the men’s best players. The
U.S. Open statistician kept track of every serve that Roger Federer
hit during the tennis tournament. The statistician reported
that the mean serve speed was 100 miles per hour (mph) and the
standard deviation of the serve speeds was 15 mph.
If the shape of the distribution is mound shaped
and symmetric, what percentage of Roger Federer’s serve speeds are
between 115 and 145 mph?
A) Approximately 84%
B) Approximately 2.5%
C) Approximately 16%
D) Approximately 97.5%