What is the standard deviation for a stock that has had annual returns over the last four years of 10%, -4%, 8% and -7%? This is a sample not a population. Enter your answer as a percentage to one decimal with no % sign.

Note: Please show work without the use of a financial calculator.

What is the standard deviation for a stock that has had annual returns over the last four years of 10%, -4%, 8% and -7%? This is a sample not a population. Enter your answer as a percentage to one decimal with no % sign