(please if you can shorten the answer thatd be great) Explain the difference between using the cosine ratio to solve for a missing angle in a right triangle versus using the secant ratio. (such as an example) to prove your point of view. (10 points)

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%