(5x 10^3) x (9x10^7)

36 inches/second = yards/minute how many yards?

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?

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%