Chebyshev's inequality

Etymology
From the surname of Russian mathematician (1821–1894), the discoverer.

Proper noun

 * 1)  The theorem that in any data sample with finite variance, the probability of any random variable X that lies k or more standard deviations away from the mean is no more than 1/k2, i.e. assuming mean μ and standard deviation σ, the probability is:
 * $$\Pr(\left|X-\mu\right|\geq k\sigma)\leq\frac{1}{k^2}$$

Translations

 * Catalan: desigualtat de Txebixov
 * Chinese:
 * Mandarin: 切比雪夫不等式
 * Czech: Čebyševova nerovnost
 * Finnish: Tšebyšovin epäyhtälö
 * French: inégalité de Tchebychev
 * German: tschebyscheffsche Ungleichung, Tschebyscheff-Ungleichung
 * Italian: disuguaglianza di Čebyšëv
 * Portuguese: desigualdade de Chebyshev
 * Russian: нера́венство Чебышёва
 * Spanish: desigualdad de Chebyshov