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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" volue to 1 decimal place and "Variance" to 2 decimal ploces.) b. Calculate the value of the covarlance between the stock and bond funds, (Negative value should be indicated by a minus sign. not round intermediate calculations. Round your answer to 2 decimal places.)