Find the exact perimeter of pentagon A, B, C, D, E plotted below. A) 30

B) 16 + 10 square root of 17

C) 16 + 2 square root of 85

D) 6 + 2 square root of 7 + 2 square root of 13

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%