The speed of college tennis player Jaron Jackson's first serve averages 125 mph, with a standard deviation of 4 mph.The distribution of service speeds is normal.Jaron's opponent today is certain that he can return for a winner any serve that is less than 116 mph.If this is true, what proportion of Jaron's serves will his opponent be sure to return for a winner?
A) .0341
B) .0923
C) .0014
D) .0122
E) .0763
Correct Answer:
Verified
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