Consider the following table: Required: 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 ploce and "Variance" to 4 decimal places.) b. Calculate the value of the covariance between the stock and bond funds. (Negative value should be indicated by a minus tign. Do not round intermediate calculations. Round your answer to 4 decimal places.)