Returns for the Shields Company over the last three years are shown below.What's the standard deviation of Shields' returns? (Hint: This is a sample,not a complete population,so the sample standard deviation formula should be used.) $\begin{array}{cr}
\text { Year } & \text { Return } \
\hline 2009 & 21.50 \% \
2008 & -12.50 \% \
2007 & 24.20 \%
\end{array}$
A)19.94%
B)20.45%
C)20.97%
D)21.49%

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The Answer of Returns for the Shields Company over the last three years are shown below.What's the standard deviation of Shields' returns? (Hint: This is a sample,not a complete population,so the sample standard deviation formula should be used.) $\begin{array}{cr}
\text { Year } & \text { Return } \
\hline 2009 & 21.50 \% \
2008 & -12.50 \% \
2007 & 24.20 \%
\end{array}$
A)19.94%
B)20.45%
C)20.97%
D)21.49%

Returns for the Shields Company Over the Last Three Years Year Return 200921.50%2008−12.50%200724.20%\begin{array}{cr}\text { Year } & \text { Return } \\\hline 2009 & 21.50 \% \\2008 & -12.50 \% \\2007 & 24.20 \%\end{array} Year 200920082007​ Return 21.50%−12.50%24.20%​​

Returns for the Shields Company Over the Last Three Years $\begin{array}{cr}\text { Year } & \text { Return } \\\hline 2009 & 21.50 \% \\2008 & -12.50 \% \\2007 & 24.20 \%\end{array}$