Probability density function (pdf) of a continuous random variable X is a function that satisfies the following requirements.
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If the random variable X is discontinuous the probability mass function is considered.
Probability mass function (pmf) of a discontinuous random variable X is a function that satisfies the following requirements.
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with [Error: Macro 'mathequation' doesn't exist]
being the probability of event [Error: Macro 'mathequation' doesn't exist]
.
In case of a continuous random variable X a probability density function is considered.
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