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In [[probability theory]] and [[statistics]], the '''cumulative distribution function''' ('''CDF''') of a realvalued [[random variable]] <math>X</math>, or just '''distribution function''' of <math>X</math>, evaluated at <math>x</math>, is the [[probability]] that <math>X</math> will take a value less than or equal to <math>x</math>.
In the case of a [[continuous distribution]], it gives the area under the [[probability density function]] from minus infinity to <math>x</math>, and is a [[Logistic
==Definition==

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