You are given the following information: a) What are the expected returns and standard deviations of a portfolio consisting of: 100 percent in stock A? 100 percent in stock B? 50 percent in each stock? 25 percent in stock A and 75 percent in stock B? 75 percent in stock A and 25 percent in stock B? b) Plot the above 5 portfolios in a) in the return and risk two-dimensional graph. c) Redo the calculations assuming the correlation coefficient of the returns on the two stocks is -0.6. What is the impact of this difference in the correlation coefficient? Also, plot the 5 portfolios in the return-risk graph