Here are the returns on two stocks, January February March April May June July August Digital Cheese +15 -2 +4 +6 Executive Fruit +8 1 +4 +16 +2 a-1. Calculate the variance and standard deviation of each stock. (Do not round intermediate calculations. Round your answers to 2 decimal places.) Digital Cheese Retum Executive Fruit Return Variance Standard deviation % 9 0-2. Which stock is the riskier if held on its own