19. Poisson Distribution
The Poisson distribution is a discrete probability distribution essential in modeling the occurrence of events over fixed intervals, with applications spanning engineering and physical sciences. This distribution, characterized by its mean and variance both equal to λ, emerges as a limit of the Binomial distribution under specific conditions. Its applications are significant in varied fields such as telecommunications, quality control, and signal processing.
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What we have learnt
- The Poisson distribution is utilized to model the number of independent events occurring in fixed intervals.
- Both the mean and variance of the Poisson distribution are equivalent to λ.
- The distribution is derived from the Binomial distribution in the limit of large trials and small success probability, with broad applications in various fields.
Key Concepts
- -- Poisson Distribution
- A discrete probability distribution that models the number of events occurring in a fixed interval, assuming a constant mean rate and independence of events.
- -- Mean and Variance
- In a Poisson distribution, both the mean and variance are represented by the parameter λ.
- -- Poisson's Equation
- A second-order partial differential equation used across various disciplines, relating to phenomena described by Poisson-distributed events.
- -- Additive Property
- If X1 and X2 are independent Poisson random variables, their sum also follows a Poisson distribution with parameter equal to the sum of their parameters.
- -- Memoryless Nature
- A property indicating that the Poisson process allows events to occur independently of each other without memory.
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