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Smart Inc.'s stock has following returns over the past 4 years: 7 percent, 12 percent, -8 percent, and 20 percent. What was the arithmetic average

  1. Smart Inc.'s stock has following returns over the past 4 years: 7 percent, 12 percent, -8 percent, and 20 percent. What was the arithmetic average return on the company's stock over this four-year period? What was the variance of the company's returns over this period? 

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