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The last four years of returns for a stock are as follows:  Year 1 2 3 4 Return - 3

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The last four years of returns for a stock are as follows: 
Year 1 2 3 4 Return - 3.7% 28 2% 12 2% 3 9% 
a. What is the average annual return? b. What is the variance of the stock's returns? c. What is the standard deviation of the stock's returns?