What is the length of the hypotenuse to the nearest hundredth place in the diagram below?
570
4cm
A 2.60
B 6.16
C 4.77
D 7.34

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%