For a random variable XXX, which inequality relates mean and variance?
E[X2]≥(E[X])2E[X^2] \ge (E[X])^2E[X2]≥(E[X])2
E[X2]≤(E[X])2E[X^2] \le (E[X])^2E[X2]≤(E[X])2
Var(X)=E[X2]+E[X]2Var(X) = E[X^2] + E[X]^2Var(X)=E[X2]+E[X]2
E[X]=Var(X)E[X] = Var(X)E[X]=Var(X)