the following are possible states of the economy and the returns associated with stocks A and B in those states. Return on B Return on A Probability State $0\mathrm{.}180\mathrm{.}240\mathrm{.}3$ Good $0\mathrm{.}280\mathrm{.}360\mathrm{.}4$ Normal $0\mathrm{.}07-0\mathrm{.}080\mathrm{.}3$ Bad what is the average return of A what is the average return of B what is the standard deviation of A what is the standard deviation of b$,$ what is the covariance between stock A and stock B what is the correlation what is portfolio risk if A weight is $60\%$ what is the return of the portfolio if stock B weight is $70\%$