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. Data table (Click on the icon located on the top-right corner of the data table below in order to copy its contents into a spreadsheet.) Year Return 1 -3.8% 2 + 28.2% 3 + 12.3% 4 + 3.8%