help on these .. ty

A pension fund manager is considering three mutual funds: a stock fund, a bond fund and a T-bill money market fund. The T-bill fund yields a sure return of 5.5%. The probability distribution of the risky funds are Stock fund Bond fund Expected return I 5% 990 Standard deviation 32% 23% The correlation between the fund return is 0.15 What's the expected return of a portfolio with 20% invested in stock fund and the rest in bond fund? A) -5% B) 0% C) 10.2% D) none of the above 4 What's the standard deviation of the return of the portfolio with 20% invested in stock fund and the rest in bond fund? A) -0.5 B) 0 C) 0.25 D) 0.2031 5. What's the expected return and risk of the tangency portfolio? (HW3, use the "secret formula") A) 12.88%, 23.34% B) 12.16%, 18.41% C) 20%, 30% D) 30%, 35%