chebyshevs inequality

World English Dictionary
Chebyshev's inequality (ˈtʃɛbɪˌʃɒfs)
 
n
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
 
[named after P. L. Chebyshev (1821--94), Russian mathematician]

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