Problem 11-19 Diversification (L03) Here are the returns on two stocks. Digital Executive Cheese Fruit January +18 +6 February -2 +2 March +4 +5 April +6 +15 May -3 +2 June +3 +7 July -1 -2 August -7 -1 Required: a-1. Calculate the variance and standard deviation of each stock. a-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? Complete this question by entering your answers in the tabs below. Reg A1 Req A2 Reg B Regc Calculate the variance and standard deviation of each stock. (Do not round intermediate calculations. Round your answers to 2 decimal places.) Digital Cheese Executive Fruit Retum Return Variance % Standard deviation %