10. The following spreadsheet contains monthly returns for Cola Co. and Gas Co. for 2013. Using these data, estimate the average monthly return and volatility for each stock (see MyFinanceLab for the data in Excel format). Gas Co. -6.00% Date Cola Co. Jan -10.84% Feb 2.36% 1.28% Mar 6.60% -1.86% Apr 2.01% -1.90% May 18.36% 7.40% June -1.22% -0.26% July 2.25% 8.36% Aug -6.89% -2.46% Sep -6.04% -2.00% Oct 13.61% 0.00% Nov 3.51% 4.68% Dec 0.54% 2.22%