The last four years of returns for a stock are as shown here: 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. 0 Data Table X (Click on the following icon in order to copy its contents into a spreadsheet.) Year Return 1 -4.0% 2 + 28.0% 3 + 12.0% 4 +4.0%