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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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    Solution Preview

    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 = ...

    Solution Summary

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