1. Consider an environment of 20 individual risky securities and one risk free asset. One investor is selecting between the Markowitz mean-variance frontier framework and the index model in the portfolio analysis. Answer the following questions: 4 (a) How many parameters are used as the input to construct the mean-variance frontier? (5 marks) (b) How many inputs are used for the index model? (5 marks) Total: 10 marks.