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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.

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

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