Could you plz answer these problem with step so I can understand the answer

(Answer with the step) Based on the following data: 1/Calculate the average return and the standard deviation of returns for stock A year stock A rate of return 200X -5% 200Y 15% 200Z 30% 2/Use the following data: state of the Economy probability Boom 0.2 Good 0.35 Poor 0.25 Bust 0.2 stock A : return 30% 12% 1% -20% stock B: return 45% 10% -15% -30% A) calculate the expected returns and standard deviation of return for A and B? B) if the portfolio is formed by investing 40% of the funds each in A and 60% in B; what would be the expected return on the portfolio? c) what would be the stander deviation of the above portfolio? 3) A firm's stock has a beta of 0.9; the expected return on the market is 10%; and the risk-free rate is 5%. What is the expected rate of return on this stock? 4) the expected return on the market is 14%; and the risk -free is 5% what is the risk premium