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. a. What is the average annual return? The average return is %. (Round to two decimal places.) 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. a. What is the average annual return? The average return is %. (Round to two decimal places.) Consider the following five monthly returns: a. Calculate the arithmetic average monthly return over this period. b. Calculate the geometric average monthly return over this period. c. Calculate the monthly variance over this period. d. Calculate the monthly standard deviation over this period. a. Calculate the arithmetic average monthly return over this period. The arithmetic average is \%. (Round to two decimal places.) 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.)