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At a tennis tournament a statistician keeps track of every serve. 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 speed was 14 mph. If nothing is known about the shape the distribution, give an interval that will contain the speeds approximately three-fourths of the player’s serves. A. 114-130 mph B. 74-122 mph C. 90-106 mph D. 82-114 mph
Sagot :
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