need geometric mean already solved volatility

An asset had annual returns of 12,18,6,9, and 5 percent, respectively, for the last five years. What is the volatility of these returns? Find the data in excel here B. 0.008100.040520.100650.010130.01065 What is the geometric mean of the five returns in the previous question? 6.40% 6.80% 6.13\% 6.01% 6.25%