please give the answer of a,b and c

21. (Using the CAPM to find expected returns) a. Given the following holding-period returns, compute the average returns and the standard deviations for the Zemin Corporation and for the market portfolio. Month 1 2 Zemin Corp. 6% 3 Market 4% 2 2 3 -1 1 -3 4 5 5 0 -2 2 2 6 b. If Zemin's beta is 1.54 and the risk-free rate is 4 percent, what return would be expected by an investor owning Zemin? (Note: Because the preceding returns are based on monthly data, you will need to annualize the returns to make them comparable to the risk-free rate. For simplicity, you can convert from monthly returns to yearly returns by multiplying the average monthly returns by 12.) c. How does Zemin's historical average return compare with the return you should expect based on the CAPM and the firm's systematic risk