The area of the rectangle is 110 m²
What is the area of the shaded triangle?
A 11 m²
55 m²
© 110 m²
O 220 m²

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%