Here are the percentage returns on two stocks Digital Executive Month Cheese Fruit January February 16% 4% -4 2 March 4. 6 April May 16 -5 3 4 6 June July August -5 -3 -7 -3 a-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 Variance Standard deviation % 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 % c. Is the variance more or less than half way between the variance of the two individual stocks? more than the 50%-50% less than the 50%-50%