Consider the following table: Stock Fund Bond Fund Scenario Probability Rate of Return Rate of Return Severe recession $0\mathrm{.}10-41\%-14\%$ Mild recession $0\mathrm{.}20-21\%20\%$ Normal growth $0\mathrm{.}4026\%13\%$ Boom $0\mathrm{.}3031\%-10\%$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 $\%$ Varianceb. 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