ENGDAN Chapter 3, 3.3 Poisson Distribution

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Last updated 2:26 PM on 3/11/26
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6 Terms

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Poisson Distribution

A discrete probability distribution that models the number of times an event occurs in a fixed interval of time or space when events occur independently and at a constant average rate.

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Poisson Parameter (λ)

The average number of occurrences of an event in a given interval.

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Poisson Probability Formula

The formula used to calculate the probability that a given number of events occurs in a fixed interval.

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Mean of Poisson Distribution

The average number of occurrences which is equal to λ.

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Variance of Poisson Distribution

The measure of spread of the Poisson distribution which is also equal to λ.

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Standard Deviation of Poisson Distribution

The square root of λ which measures the spread of the distribution.