Decide whether this statement is "always, sometimes, or never" "There is 1 line of symmetry in a kite"

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 anyone me with this question?

Find the value of the combination. 5 c 5