A im bored:) Free points ig

Solve the equation using the given values: x= -2.5; y= -7.51. 2xy + 2x²

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’s the answer ? use the picture to see the problem