-6 1/3 what is true
A. -6 + -1/3
B.6 + 1/3
c.-6 1/3
D.6 + -1/3

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%