3 (16 points) Suppose that the CAPM is a valid description of security returns over the next 12 months and you, being a financial analyst, are analyzing some securities. You have the following data: r = 6% risk-free rate of return E[r]=12% expected return on the market = 18% standard deviation of the market return a. Write down an equation that relates the expected return of a stock X, E[rx], to its systematic risk. (4 points) b. What is the expected return of X if X's beta is 1.5? (4 points) c. Is it possible to have a stock A with expected return of 10% and standard deviation of 20%? Why or why not? (4 points) d. Is it possible to have a stock B with expected return of 18% and standard deviation of 24%? Why or why not? (4 points)