Question 2 (20 points) An economy has a large number of securities. The average variance v of returns is 0.5 and the average covariance c between returns is 0.1. (a) What is the risk (as measured by the standard deviation of returns) of an equally-weighted portfolio containing 5 securities? (b) What is the minimum number of securities that must be held for the risk of an equally- weighted portfolio to be within 10% of the theoretical minimum