3. (Bounds on returns) Consider a universe of just three securities. They have expected rates of return of 10%, 20%, and 10%, respectively. Two portfolios are known to lie on the minimum-variance set. They are defined by the portfolio weights .60 w= 20 .20 .807 V= -20 40 It is also known that the market portfolio is efficient. (a) Given this information, what are the minimum and maximum possible values for the expected rate of return on the market portfolio? (b) Now suppose you are told that w represents the minimum-variance portfolio. Does this change your answers to part (a)