The following are the monthly rates of return for Madison Cookies and for Sophie Electric during a six-month period. Month Madison Sophie Cookies Electric 1 -0.04 0.05 2 0.04 -0.01 3 -0.06 -0.08 4 0.13 0.13 5 -0.02 -0.08 6 0.07 0.01 Compute the following. Do not round intermediate calculations. Round your answers to four decimal places. a. Average monthly rate of return Ri for each stock. Madison Cookies: Sophie Electric: b. Standard deviation of returns for each stock. Madison Cookies: Sophie Electric: C. Covariance between the rates of return. d. The correlation coefficient between the rates of return