1. The problem statement, all variables and given/known data prove or disprove that E[X^2] = E(X)^2 2. Relevant equations E[X] = [tex]\sum[/tex]xi*pr(xi) 3. The attempt at a solution I really don't know where to start, I believe that it is not true, so I should try to disprove it, and the easiest way to do that would be by counterexample... I don't understand expectation very well though, I could try to do a mathematical proof to show that they are not equal, but I don't know how to go about that either.