Returns for the Alcoff Company over the last 3 years are shown below. What's the standard deviation of the firm's returns? (Hint: This is a sample, not a complete population, so the sample standard deviation formula should be used.)
Year
Return
2010
21.00%
2009
?12.50%
2008
25.00%
A. 20.08%
B. 20.59%
C. 21.11%
D. 21.64%
E. 22.18%
Answer: B
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