Cosider again the four portfolios: Portfolio Expected return Volatility 15% 32% X 12% 14% Y 9% 18% Z 6% 10% and assume the correlation matrix is W X Y Z 1 0.5 0.7 0.1 0.5 1 0.3 0.6 0.7 0.3 1 0.4 0.1 0.6 0.4 1 W X Y Z (a) What are expected return and volatility of an equally weighted portfolio of W and X? (b) What are expected return and volatility of an equally weighted portfolio of W, X and Y? (c) What are expected return and volatility of an equally weighted portfolio of W, X, Y and Z? (d) What are expected return and volatility of a portfolio with weights ww = 30%, wx = 70%? (e) What are expected return and volatility of a portfolio with weights ww = = 70%, wy=-2 = -20%? 50%, wx