Solve the below:
Q: Discrete Probability Distribution (I)
Expectation of product of independent stochastic variables
Covariance between two random variables
Show that Cov ( summation of a_i x_i , where i is varying from 1 to n , summation of b_j x_j , where j is varying from 1to n ) = Double summation of a_i b_j Cov (x_i , x_j ) where both i and j are independently varying from 1 to n