Using the data in the following table, $,$ calculate the volatility $($standard deviation$)$ of a portfolio that is $69\%$ invested in stock A and $31\%$ in stock B$.$

The volatility of the portfolio is $\%.($Round to two decimal places.$)$

Data table

$($Click on the following icon

$\backslash$table$[[$Year$,2010,2011,2012,2013,2014,2015],[$Stock A$,-12\%,5\%,10\%,-10\%,4\%,13\%$