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The probability density function of a continuous random variable can be determined from the cumulative distribution function by differentiating.
[[Probability density function
Given ''F''(''x''),
''f (x) ='' <math>{dF(x) \over dx}</math>, as long as the derivative exists.▼
The CDF of a [[continuous random variable]] <math>X</math> can be expressed as the integral of its probability density function <math>f_X</math> as follows:<ref name="KunIlPark" />{{rpp. 86}}
