1. Consider the table below: A B C D o 2 3 1 4 [3 1 5 1.3 U 8 {l 9 as 3 1 2 4 If in m : 8 and (rm : 5, calculate the following: a. The mean return for each security. b. The variance of each security's return. c. The covariance of returns between each security