Here are the percentage returns on two stocks. Digital Cheese Executive Fruit Month January February March April May June July August Variance Standard deviation % 15% -3 5 7 Digital Cheese O Executive Fruit 00NWA -4 Variance Standard deviation % 3 -2 -8 7% 1 4 13 2 5 -3 a-1. Calculate the monthly variance and standard deviation of each stock. (Do not round Intermediate calculations. Round your answer to 1 decimal place.) -2 ~ Digital Cheese a-2. Which stock is the riskler if held on its own? 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 answer to 1 decimal place.)