Cant seem to figure this out.. solve and show work, thank you!

8. Based on the following data; (a) calculate the expected return and the standard deviation of returns for each stock State of the Economy Recession Probability 0.2 0.65 0.15 Stock A Rate of Return Stock B Rate of Return Normal Growth Boom 4% 8% 16% -20% 20% 60% (b) Calculate the expected return and the standard deviation on the portfolio, where the portfolio is formed by investing 50% of the funds in Stock A and the rest in Stock B