Consider the following table: Scenario Severe recession Mild recession Normal growth Boom Probability 0.10 0.20 0.30 0.40 Stock Fund Rate of Return -438 -17.0% 17% 31% Bond Fund Rate of Return -12% 12% 6% 4% a. Calculate the values of mean return and variance for the stock fund. (Do not round intermediate calculations. Round "Mean return" value to 1 decimal place and "Variance" to 4 decimal places.) Mean return Variance % %-Squared b. Calculate the value of the covariance between the stock and bond funds. (Negative value should be indicated by a minus sign. Do not round intermediate calculations. Round your answer to 4 decimal places.) Covariance %-Squared