Here are the returns on two stocks Digital Cheese -19 Executive Fruit 49 January February March April May June July August . nced Required: 6-1. Calculate the variance and standard deviation of each stock 0-2. Which stock is riskier if held on its own? b. Now calculate the returns in each month of a portfolio that invests an equal amount each month in the two stocks c. Is the variance more or less than halfway between the variance of the two individual stocks