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A stock has produced returns of 11 percent, 18 percent, -6 percent, -13 percent, and 21 percent for the past five years, respectively. What is the standard deviation of these returns?
year return return-mean)^2 1 11% 0.23% 2 18% 1.39% 3 -6% 1.49% 4 -13% 3.69% 5 21% 2.19% total 31% 8.99% mean = total/count…

31%/5 6.20% Standard deviation =( (return-mean)^2/N)^1/2 (0.08988/5)^(1/2) 13.41%

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