Using your estimates from Problem 9 and the fact that the correlation of A and B is 0.48, calculate the volatility (standard deviation) of a portfolio that is 70% invested in Stock A and 30% invested in Stock B.

\begin{tabular}{|l|l|l|} \hline & Stock A & Stock B \\ \hline 1 & 0.10 & 0.06 \\ \hline 2 & 0.07 & 0.02 \\ \hline 3 & 0.15 & 0.05 \\ \hline 4 & -0.05 & 0.01 \\ \hline 5 & 0.08 & -0.02 \\ \hline \end{tabular} \begin{tabular}{|l|l|l|} \hline & Stock A & Stock B \\ \hline 1 & 0.10 & 0.06 \\ \hline 2 & 0.07 & 0.02 \\ \hline 3 & 0.15 & 0.05 \\ \hline 4 & -0.05 & 0.01 \\ \hline 5 & 0.08 & -0.02 \\ \hline \end{tabular}