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

Year	1	2	3	4
Return	3.9%	+27.7%	+11.9%	+4.5%

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.