The following spreadsheet contains monthly returns for Cola Co. and Gas Co. for 2013. Using these data, estimate the average monthly return and the volatility for each stock Month Cola Co 5.80% -0.20% 4.64% -1.00% 0.50% 1.50% 1.80% 7.00% 0.40% 1.40% 1.90% 10.20% Gas Co January February March April May June July August September October November December 0.50% 0.50% 6.00% 6.90% 1.10% 0.90% 2.50% 2.80% -4.10% 3.60% 1.10%