Calculate the mean and standard deviation of the portfolio. The proportions invested in each stock are shown in parentheses. a. Canadian National Railway (CNR): 10%, Enbridge (ENB): 40%, Loblaw (L): 40%, Manulife Financial (MFC): 10% b. CNR: 50%, ENB: 30%, L: 10%, MFC: 10% c. CNR: 70%, ENB: 10%, L: 10%, MFC: 10% d. Which portfolio would a gambler choose? Explain. e. Which portfolio would a risk-averse investor choose? Explain.