Statistics. 4-5: The Poisson Distribution. Definition. The Poisson distribution is a discrete probability distribution that applies to occurrences of some event over a specified interval . The random variable x is the number of occurrences of the event in an interval.
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The Poisson Distribution
µx• e -µ
P(x) = wheree 2.71828
-Go to dist., then choose poissonpdf on your calculator.
Rule of Thumb
Value for μ
= n • p