A car travels 354 miles on 11 gallons of gasoline. The best estimate of the car’s miles per gallon is: Select one:
a. 39
b. 35
c. 32
d. 24

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%