[:Chebysheff's inequality:] • For a random variable XX and fixed ε>0\varepsilon > 0, • P(XEXε)σ2(X)ε2P(\lvert X - \mathbb E X \rvert \geq \varepsilon) \leq \sigma^2(X)\varepsilon^{-2} • Immediate consequence of Markov's inequality Referenced by: