The last four years of returns for a stock are as follows:

Year	1	2	3	4
Return	3.7%	28.5%	11.5%	4.3%

a. What is the average annual return? (round to 2 decimal places)

b. What is the variance of the stock's returns? (round to five decimal places. write as a percentage and a decimal)

c. What is the standard deviation of the stock's return (I think you can round to the second decimal place)