5 (40 marks). Assume that you manage a risky portfolio with an expected rate of return of 18% and a standard deviation of 28%. The T-bill rate (risk-free rate) is 7%. Your client chooses to invest 70% in the risky portfolio in your fund and 30% in a T-bill money market fund. We assume that investors use mean-variance utility: U = E(r) 0.5 A2, where E(r) is the expected return, A is the risk aversion coefficient and 2 is the variance of returns. a) What is the expected value and standard deviation of the rate of return on your client's portfolio