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?

0.086%

0.533%

1.11%

2.22%

Question

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?

0.086%

0.533%

1.11%

2.22%

miracrown · Answer

Please post this in the math section.

miracrown · Answer

Here: http://openstudy.com/study#/groups/Mathematics