I need the work for this but I don't get it and I'm a junior in a sophmore class Please help I will Give the brainleist to any one who answers this and fast. Just show work for why the right answers are right. PLZ

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%