Here are the percentage returns on two stocks.

Month Digital Cheese Executive Fruit

January 15% 7%

February 4 2

March 5 5

April 7 13

May 5 1

June 3 5

July 3 3

August 9 1

a-1. Calculate the monthly variance and standard deviation of each stock. (Do not round intermediate calculations. Round your answers to 1 decimal places.)a-2. Which stock is the riskier if held on its own?b. Now calculate the variance and standard deviation of the returns on a portfolio that invests an equal amount each month in the two stocks. (Do not round intermediate calculations. Round your answers to 1 decimal places.)c. Is the variance more or less than half way between the variance of the two individual stocks?