6. You manage a risky portfolio with expected rate of return of 18% and standard deviation of 28%. The T-bill rate is 8%. a. Your client chooses to invest 70% of a portfolio in your fund and 30% in a T-bill money market fund. What is the expected value and standard deviation of the rate of return on his portfolio? b. Suppose that your risky portfolio includes the following investments in the given proportions: Stock A, 25%; Stock B, 32%; Stock C, 43%. What are the investment proportions of your client's overall portfolio, including the position in T-bills? c. What is the reward-to-volatility ratio (S) of your risky portfolio? Your client's