Help pls (8grade math)

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%

James was playing a game with his friends. he won 35 points. then he lost 15, lost 40 and won 55. how did he come out

Which of these tools or constructions is used to inscribe a hexagon inside a circle?