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

Year 1 2 3 4 Return -3.9% 28.3% 11.9% 4.3%

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.