Here are the percentage retums on two stocks Digital Executive Month Cheese Fruit January 14 64 February 1 March 6 4 April 14 May 2 June 6 July August -2 8 2-1. 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 % a-2. Which stock is the riskler if held on its own? Digital Cheese Executive Fruit b. Now calculate the variance and standard deviation of the returns on a portfolio that invests lan equal amount each month in the two stocks. (Do not round intermediate calculations. Round your answers to 1 decimal places.)