Which is the best estimate for the following quotient

All per-unit concepts rely on ratios,meaning,to provide a type of measurement

Why did the ice arena get so hot after the big game (this is math related google it to find the paper

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%