Tracy is running a trail in hanna park she can run 1 mile in 10 minutes yanni is running the same trail as tracy johnny can run a mile in five minutes but starts running 20 minutes after tracy started on the trail if they started the trail from the same point how long will it take yanni to catch tracy

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%