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A stock produced returns of 11 percent, -14 percent, and 3 percent over three of the past four years. The arithmetic average for the past four years is 6.5 percent. What is the standard deviation of the stock's returns for this four year period?

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Q: A stock produced returns of 11 percent -14 percent and 3 percent over three of the past four years The arithmetic average for the past four years is 6.5 percent?
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