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Here are the returns on two stocks Digital Executive Cheese Fruit +7 +15 January February March April May June July August +4 +13 a-1. Calculate the variance and standard deviation of each stock. (Do not round intermediate calculations. Round your answers to 2 decimal places.) Digital Cheese Executive Fruit Retum Return Variance 47.48 23.23 4.82 Standard deviation 6.89 a-2. Which stock is the riskier if held on its own? Digital Cheese OExecutive Fruit b. Now calculate the returns in each month of a portfolio that invests an equal amount each month the two stocks. (Negative amounts should be indicated by a minus sign. Do not round intermedii calculations. Round your answers to 2 decimal places.) Portfolio Return Month