11. 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 for the data in Excel format).

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Date Cola Co. Gas Co. Jan -10.84% -6.00% 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%