The volatility of a stock is defined to be the standard deviation of the stock's return over a certain length of time. A sample of 12 consecutive monthly returns for stock ABC is provided below. The returns are provided as percentages.

1-1.52.9-0.91.30.32.6-0.8-1.40.5-13

Use the1-Var Statscalculator function and this sample information to estimate the monthly volatility for the stock . In other words, find the standard deviation for the sample of monthly returns.

Multiply this number by 12 to find the annual volatility of the stock.

Express your answer as a percentage. Round your answer to two decimal places.