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Questo 4 Incorrect 000 points out of 100 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 65 percent. What is the standard deviation of the stock's returns for this four-year period? Flag question Select one a E 18 34 percent DA 8 33 percent CD 16.66 percent d. 8 10 67 percent X e 14.43 percent