Month 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. (Click on the following icon e in order to copy its contents into a spreadsheet.) January February March April May June July August September October November December Cola Co. 0.30% - 4.70% 3.96% 1.90% 3.90% - 6.80% -2.30% 7.50% 6.40% 8.00% -6.38% 5.40% Gas Co. 1.50% - 1.30% 5.40% - 1.30% 4.50% - 7.30% - 10.10% 5.70% -5.40% - 3.00% - 5.30% -0.60%