Exercise 5. Use Excel or something similar for this exercise. Collect five years of monthly price data for two stocks. Calculate the returns. Compute the mean, variance, and covariance of returns for these stocks. Plot all possible portfolios in mean-standard deviation space. Take the monthly risk free rate to be 0.1 percent (so 0.001). Plot the optimal capital allocation line. Approximately, what is the optimal portfolio? Write a couple paragraphs about what you did and what you find. Include the graphs asked for. Exercise 5. Use Excel or something similar for this exercise. Collect five years of monthly price data for two stocks. Calculate the returns. Compute the mean, variance, and covariance of returns for these stocks. Plot all possible portfolios in mean-standard deviation space. Take the monthly risk free rate to be 0.1 percent (so 0.001). Plot the optimal capital allocation line. Approximately, what is the optimal portfolio? Write a couple paragraphs about what you did and what you find. Include the graphs asked for