Here are the returns on two stocks. Digital Cheese +15 Executive Fruit +7 +5 +4 +13 January February March April May June July August 00 NA -2 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 Retum Executive Fruit Return Variance Standard deviation a-2. Which stock is the riskier if held on its own? Digital Cheese Executive Fruit b. Now calculate the returns in each month of a portfolio that invests an equal amount each month in the two stocks. (Negative amounts should be indicated by a minus sign. Do not round intermediate calculations. Round your answers to 2 decimal places.) Month Portfolio Return January February March April May June July August c. Is the standard deviation more or less than half way between the variance of the two individual stocks? Less More