second time posting this pls answer everything what is the volatility of BOTH cola and gas????

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% The average monthly return for Cola Co. is 1.63 %. (Round to two decimal places.) The average monthly return for Gas Co. is -.8 %. (Round to two decimal places.) The volatility for Cola Co. is %. (Round to two decimal places.)