What Is the Standard Deviation of a Portfolio That Is $\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad$

What is the standard deviation of a portfolio that is invested 40% in share Q and 60% in share R?
$\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad$ Returns if
$\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad\quad$ State Occurs
$\begin{array}{|l|l|l|l|}\hline \text { State of Economy } & \text { Probability of State of Economy } & \text { ShareQ } & \text { Share R } \\\hline \text { Boom } & 25 \% & 18 \% & 9 \% \\\hline \text { Normal } & 75 \% & 9 \% & 5 \% \\\hline\end{array}$

A) 0.7%
B) 1.4%
C) 2.6%
D) 6.8%
E) 8.1%