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 in order to copy its contents into a spreadsheet.) \begin{tabular}{lrr} \hline Month & Cola Co. & Gas Co. \\ \hline January & 6.00% & 1.70% \\ February & 1.90% & 2.90% \\ March & 0.20% & 2.90% \\ April & 1.90% & 5.40% \\ nan. & nnn,, & 01nn,, \end{tabular} March April May June July August 0.20%1.90%3.60%1.30%0.50%4.60%2.90%5.40%8.10%2.10%1.50%4.50% \begin{tabular}{lrr} August & 4.60% & 4.50% \\ September & 1.90% & 11.00% \\ October & 1.70% & 4.80% \\ November & 5.50% & 2.50% \\ December & 4.80% & 3.10% \\ \hline \end{tabular}