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{{short descriptionprobability that random variable X is less than or equal to x.}}
{{refimprovedate=March 2019}}
==Definition==
The cumulative distribution function of a realvalued [[random variable]] <math>X</math> is the function given by<ref name=KunIlPark>{{cite book  author=Park, Kun Il title=Fundamentals of Probability and Stochastic Processes with Applications to Communications publisher=Springer  year=2018  isbn=9783319680743}}</ref>{{rpp. 77}}
{{Equation box 1

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