Scenario Severe recession Mild recession Normal growth Boom Probability 0.05 0.25 0.40 0.30 Stock Fund Rate of Return -250 -58 100 158 Bond Fund Rate of Return -100 168 98 -66 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 2 decimal places.) Mean return 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 2 decimal places.) Covariance