Consider the following table: Scenario Probability Rate of Return of Stock Fund Rate of return of Bond Fund Severe recession 0.10 40% 13% Mild recession 0.20 20% 19% Normal growth 0.40 25% 12% Boom 0.30 30% 9% a. Calculate the values of mean return and variance for the stock fund. b. Calculate the value of the covariance between the stock and bond funds..