There is a $31\mathrm{.}69\%$ probability of a below$-$average economy and a $68\mathrm{.}31\%$ probability of an average economy. If there is a below$-$average economy, Stocks A and $B$ will have returns of $-2\mathrm{.}26\%$ and $2\mathrm{.}74\%,$ respectively. If there is an average economy, Stocks A and $B$ will have returns of $8\mathrm{.}35\%$ and $7\mathrm{.}87\%,$ respectively. Compute the following for Stocks A and B: $($Please write all answers as percentages $($e$.$g$.\mathrm{.}1234$ should be written as $12\mathrm{.}34)$:

A$.$ Stock A Expected Return: $\%$

B$.$ Stock B Expected Return: $\%$

C$.$ Stock A Standard Deviation: $\%$

D$.$ Stock B Standard Deviation: $\%$