Chebyshev is known for his work in the fields of probability, statistics, mechanics, and number theory. The Chebyshev inequality states that if X is a random variable with standard deviation σ > 0, then the probability that the outcome of X is no less than aσ away from its mean is no more than 1/a^2:
cf. https://en.wikipedia.org/wiki/Pafnuty_Chebyshev
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