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.) The average monthly return for Cola Co. is %. (Round to two decimal places.) \begin{tabular}{|l|r|r|} \hline \multicolumn{1}{|c|}{} & Cola Co. (\%) & Gas Co. (\%) \\ \hline January & 0.068 & 0.03 \\ \hline February & 0.074 & 0.077 \\ \hline March & 0.021 & 0.002 \\ \hline April & 0.043 & 0.031 \\ \hline May & 0.113 & 0.01 \\ \hline June & 0.014 & 0 \\ \hline July & 0.041 & 0.048 \\ \hline August & 0.006 & 0.038 \\ \hline September & 0.008 & 0.058 \\ \hline October & 0.019 & 0.012 \\ \hline November & 0.007 & 0.023 \\ \hline December & 0.029 & 0.047 \\ \hline \end{tabular}