A company has had historical returns of 17.4%, 14.2%, -2.1%, -6.3%, 25.2%, 19.8%, 12.1%, 7.9% -1.4%, 10.7%, and 16.2% during the last 11 years. Given this information, what is the volatility (i.e. the standard deviation of historical returns) of these returns? 098.81% 10.15% O 13.42% 89.82% O 6.88% 0 9.94% 51.23%