Hey I need help with angles

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%

Need showing work for this problem 56.25 ×25.80

An ant travels at a constant rate of 30cm every 2 minutes.at what speed does the ant travel per minute