Gloria Trench checked her gas mileage and found that she had used 16.6 gallons of gas to travel 372 miles. At this rate, how many gallons will she use to travel from San Francisco to Washington D. C.,a distance of 2850 miles?

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%