Please help me with this

Which is a reasonable estimate of the amount of water in a small, inflatable pool used by children?

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals

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%