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OpenStudy (anonymous):
The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. If a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. What is the margin of error of the sample mean? A. 0.086% B. 0.533% C. 1.11% D. 2.22% Really don't know what this is asking and I cant find a solution.
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