Here are the returns on two stocks. Digital Cheese Executive Fruit January +15 +7 February −3 +1 March +5 +4 April +7 +13 May −4 +2 June +3 +5 July −2 −3 August −8 −2 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