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 January February March April May June July August September October November December Cola Co. - 6.80% 7.40% -2.10% 4.30% 11.30% 1.40% 4.10% -0.60% 0.80% 1.90% 0.70% -2.90% Gas Co. - 3.00% -7.70% 0.20% 3.10% - 1.00% 0.00% 4.80% -3.80% - 5.80% 1.20% 2.30% 4.70%