- #1
SammC
- 17
- 0
Homework Statement
prove or disprove that E[X^2] = E(X)^2
Homework Equations
E[X] = [tex]\sum[/tex]xi*pr(xi)
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.