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Standard deviation

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The common stock of US Air Inc. had annual returns of 15.6 %, 2.4 % , -11.8 % and 32.9% over the past 4 years respectively. What is the standard deviation of these returns.?

a. 13.29 percent
b. 14.14 percent
c. 16.50 percent
d. 17.78 percent
e. 19.05 percent

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The expert examines standard deviation for common stock of the United States Air Inc.

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to calculate std. dev, we first need the mean (for simplicity, i will omit the % sign for now, so 15.6% is just 15.6, I will add it back later)

mean = ...

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