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You know that the standard deviation of excess return on stock A is 1

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You know that the standard deviation of excess return on stock A is 1.7418, the variance and the standard deviation for the excess market return are 1.4110 and 1.1880, respectively. The correlation coefficient between excess return on stock A and excess market return is 0.5273. Show that ?? =0.7733. (Round your results to 4 decimal number)