Chebyshev's inequality

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Chebyshev's inequality

[′cheb·ə·shəfs ‚in·i′kwäl·əd·ē]
(statistics)
Given a nonnegative random variable ƒ(x), and k > 0, the probability that ƒ(x) ≥ k is less than or equal to the expected value of ƒ divided by k.