4. The stock return has a yearly standard deviation of 9%; that of the market is 17.7%. The shareholders require 7.52% return on their investments in the company as an opportunity cost. The T-bill is expected to earn 5%, and the S&P500 Index promises 12% market return for the investors. How much is the market risk premium and the corporate risk premium? Determine the correlation coefficient between the stock and the market index 5 points