Here are the percentage returns on two stocks. Digital Executive Month Cheese Fruit January 14% 6% February -4 2 March 6 4 April 8 12 May -5 3 June 4 4 July -3 -3 August -5 -1 a-1. Calculate the monthly variance and standard deviation of each stock. (Do not round intermediate calculations. Round your answers to 1 decimal places.) Variance Standard deviation % Digital Cheese 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 answers to 1 decimal places.) Variance Standard deviation %