There is a $28\mathrm{.}80\%$ probability of a below average economy and a $71\mathrm{.}20\%$ probability of an average economy. If there is a below average economy stocks A and B will have returns of $4\mathrm{.}20\%$ and $4\mathrm{.}30\%,$ respectively. If there is an average economy stocks A and B will have returns of $8\mathrm{.}70\%$ and $4\mathrm{.}40\%,$ respectively. Compute the:

Expected Return for Stock A:

Expected Return for Stock B:

Standard Deviation for Stock A:

Standard Deviation for Stock B: