Here are the returns on two stocks. Digital Cheese Executive Fruit January +13 +6 February 2 +1 March +4 +3 April +6 +14 May 3 +2 June +2 +5 July 1 2 August 7 1 a-1. Calculate the variance and standard deviation of each stock. (Do not round intermediate calculations. Round your answers to 2 decimal places.) 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.) c. Is the standard deviation more or less than half way between the variance of the two individual stocks? Less More