The following are estimates for two stocks. The market index has a standard deviation of 22% and the risk-free rate is 8%. Required: a. What are the standard deviations of stocks ABC and DEF respectively? (4 marks) b. Suppose that we are to construct a portfolio with proportions: 30% of ABC,45% of DEF and 25% of Tbill. Compute the portfolio's (1) expected return; (2) beta; (3) non-systematic standard deviation; (4) standard deviation. (10 marks)