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. Caiculate the value of the covariance between the stock and bond funds (Negotive value should be indicated by a minus sign. D not round intermediate colculations. Round your answer to 4 decimal pleces.)