A gas tank which can hold a total of 89 liters contains only 5 liters of gas when the driver stops to refuel. If it takes 6 minutes to fill up the tank, what is the rate in liters per minute?

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%