# Chebyshev's inequality- lower bound

Let $$X$$ is a random variable, such that $$X \ge 0$$ , $$E(X)=1$$ and $$D^2(X)=3$$. I want to find the lower bound $$P(X \ge 3)$$. I'm a little confused, because we can use Chebyshev's inequality If we want to find a upper bound.

• Maybe the content of the task is wrong. – pawelK Jan 17 at 22:19