Carter has 40 identical coins with a diameter of 3.1 inches and a thickness of 0.4 inches. if he stacks all the coins on top of the other, what is the total volume of the stack of coins in cubic inches?

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%