This is proportions if you could help that would be great and thank you! I don’t know what I’m doing pls help!

Pat listed all the numbers that have 15 as a multiple write the numbers in pats list

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%

Can someone me out here number 4 plz