You are presently invested in the Luther Fund, a broad based mutual fund that invests in 7. (10 pts.) stocks and other securities. The Luther Fund has an expected return of 14% and a volatility of 20%. Risk-free Treasury bills are currently offering returns of 4%. You are considering adding a precious metals fund to your current portfolio. The metals fund has an expected return of 10%, a volatility of 30%, and a correlation of-20 with the Luther Fund. Will adding the precious metals fund improve your portfolio? Why? What is the minimum volatility of the portfolio after adding the precious metals? a. b