Problem 7-12 Dlversification Here are the percentage returns on two stocks. Digital Month January February March April May June July August Cheese 14% -4 6 8 -5 4 -3 Executive Fruit 6% 2 4 14 3 4 -5 -3 2-1. Calculate the monthly variance and standard deviation of each stock. (Do not round Intermediate calculetlons. Round your answers to 1 decimal places.) Executive Fruit Digital Cheese 0.5 7.2 Variance Standard deviation % 0.2 4.5 4-2. Which stock is the riskier if held on its own? Digital Cheese O Executive Fruit b. Now calculate the variance and standard deviation of the returns on a portfolio that invests an equal amount each month in the two stocks. (Do not round Intermediate calculations. Round your answers to 1 decimal places.) Variance Standard deviation %