What Is the Standard Deviation of a Security That Has

Multiple Choice

What is the standard deviation of a security that has the following expected returns?
$\begin{array}{lcc}\text { State of the Economy } & \text { Probability of } & \text { Rate of Return if } \\& \text { State of Economy } & \text { state occurs }\\\text { Boom } & .10 & 19 \% \\\text { Normal } & .75& 13 \% \\\text { Recession } & .15 & -7 \%\end{array}$

A) 7.48%
B) 7.61%
C) 7.67%
D) 7.82%
E) 7.91%