The product of 2 and a number x is 3/4 What is the value of x?
A. x=5/4
B. x=3/8
C. x= 1 1/4
D. x=3/2

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%