I need help with question #2

Find the balance at the end of 4 years if 1000 is deposited at the rate of

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

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%