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Chebyshev's inequality

/ˈtʃɛbɪˌʃɒfs/
noun
1.
(statistics) the fundamental theorem that the probability that a random variable differs from its mean by more than k standard deviations is less than or equal to 1/k²
Word Origin
named after P. L. Chebyshev (1821–94), Russian mathematician
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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