Download 5 years of historical monthly

(dividend-adjusted) prices for Coca-Cola (KO)

and the S&P 500 from Yahoo! Finance.

(a) Compute the monthly rates of return.

(b) Compute the average rate of return and risk of portfolios that combine KO and the S&P 500 in the following proportions:

(0.0, 1.0), (0.2, 0.8), (0.4, 0.6), (0.6, 0.4),

(0.8, 0.2), (1.0, 0.0). Then plot them against one another. What does the plot look like?

(c) Compute the market beta of Coca-Cola.