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A discrete probability distribution that expresses the probability of a given number of events occurring over a fixed period of time or space is called a Poisson distribution if : |
The events occur with a known constant mean rate The events are dependent of the time from the occurrence of the previous event. The rate of occurrence of events is not constant and based on time The probability of an event is inversely proportional to the length of the period of time |
The events occur with a known constant mean rate |
