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

Multiple Choice

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

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