Can someone please tell me the answer for this it’s due at 11:59 I really need help!!

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%

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)

Which graph represents the same relation is the sa which graph represents the same relation as the set {(-3-2)}