**Probability theory - Probability distribution | Britannica**
https://www.britannica.com/science/probability-theory/Probability-distribution

Probability theory - Probability theory - Probability distribution: Suppose X is a random variable that can assume one of the values x1, x2,…, xm, according to the outcome of a random experiment, and consider the event {X = xi}, which is a shorthand notation for the set of all experimental outcomes e such that X(e) = xi. The probability of this event, P{X = xi}, is itself a function of xi ...

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