Consider the following table: Required: a. Calculate the values of mean retum and yafiance for the stock fund, (Do not round intermediate calculations. Round "Mean return" value to 1 decimal ploce and "Vorionce" to 2 decimal ploces.) 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 calculetions. Round your answer to 2 decimal ploces.)