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

Essay

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 98 miles per hour (mph)and the standard deviation of the serve
speeds was 9 mph. Assume that the statistician also gave us the information that the
distribution of serve speeds was mound-shaped and symmetric. Find the percentage of
serves that were hit faster than 80 mph.