4. Answer the following questions given the information in the table below. Return on Stock A Return on Stock B 9% 12% 11% 5% 15% 6% 18% 8% a. Calculate the sample standard deviation and the arithmetic average return for both stocks. b. Compute the weights that will that will result in the minimum variance portfolio from combinin6g Stock A and Stock B, given a correlation of -0.3673. C. Calculate the portfolio standard deviation and expected return for a portfolio that invests 60% in A and 40% in B, given a correlation of -0.3673.