The data below presents monthly closing prices of Standard & Poor's 500 Index, Wal-Mart, and Target to calculate the holding-period returns for the 24 months from May 2011 through May 2013 Month S&P500 Walmart Target 2011 1.631 1.606 2012 May June July August September October November December January February March April May June July August September October November December January February March April May 1.684 1.633 1.682 1.757 1.806 1.848 1.783 1.859 1.872 1.884 1.924 1.960 1.931 2.003 1.972 2.018 2.068 2.059 1.995 2.105 2.068 2.086 2.182 74,84 74,49 77,94 72,98 73,96 76,75 81,01 78,69 74,68 74,70 76,43 79,71 76,77 75,07 73,58 75,50 76,47 76,27 87,54 85,88 84,98 83,93 82,25 78,05 75,86 69,50 68,86 71,25 63,31 63,98 64,79 63,93 63,27 56,64 62,54 60,51 61,75 56,76 57,95 59,59 60,07 62,68 61,82 74,00 75,91 73,61 76,83 82,07 78,83 79,29 2013 a. Use the price data from the table (use the excel available in week 7) for the Standard & Poor's 500 Index, Wal-Mart, and Target to calculate the holding-period returns for the 24 months from May 2011 through May 2013. Calculate the average monthly holding-period returns and the standard deviation of these returns for the S&P Index, Wal-Mart, and Target. Please compare the results obtained for these three series. (15 points)