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