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

Year 1 2 3 4 Return (%) -3.9 28.1 12.1 3.9

a. What is the average annual return?

b. What is the variance of the stock's returns?

c. What is the standard deviation of the stock's returns?

Note: Notice that the average return and standard deviation must be entered in percentage format. The variance must be entered in decimal format.