Consider the following table: Stock Fund Rate of Return -28% Scenario Severe recession Mild recession Normal growth Boom Probability 0.10 0.20 0.35 0.35 Bond Fund Rate of Return -10% 12% 2% 78 -8.0% 4% 42% 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 % %-Squared Variance 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