Returns for the Alcoff Company Over the Last 3 Years $$\begin{array} { l l } \text { Year } & { Retur } \\ 2010&21.00 \%\\2009 & - 12.50 \% \\2008 & 25.00 \%\end{array}$$

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.) $$\begin{array} { l l } \text { Year } & { Retur } \\ 2010&21.00 \%\\2009 & - 12.50 \% \\2008 & 25.00 \%\end{array}$$

A) 20.08%
B) 20.59%
C) 21.11%
D) 21.64%
E) 22.18%

Correct Answer:

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