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Probability function   (English)

Definition Niveau 4

For a discrete random variable X which can take values xi, a probability function is a function f(xi)=pi, which gives the probability of X taking each different value.
Note that we must have ∑i=1n pi = 1 if X has n possible values, or ∑i=1 pi = 1 if it has infinitely many possible values.

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