Q6. Suppose the expected returns and standard deviations of Stocks A and B are E(R_A) = 0.09, E(R_B) = 0.15, (A) = 0.36, and (B) = 0.62.

a. Calculate the expected return and standard deviation of a portfolio that is composed of 35 percent A and 65 percent B when the correlation between the returns on A and B is 0.5.

b. Calculate the standard deviation of a portfolio with the same portfolio weights as in part (a) when the correlation coefficient between the returns on A and B is -0.5.