Problem 11-19 Diversification (LO3) Here are the returns on two stocks. January February March April May June July August Digital Cheese +18 -2. +4 +6 -3 +3 -1 -7 Executive Fruit +6 +2 +5 +15 +2 +7 -2 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