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==Relationships between distributions==
==Relationships between distributions==
This is important for tests.<br>
This is important for exams.<br>
See [https://en.wikipedia.org/wiki/Relationships_among_probability_distributions Relationships among probability distributions].
See [https://en.wikipedia.org/wiki/Relationships_among_probability_distributions Relationships among probability distributions].


===Poisson Distributions===
===Poisson Distributions===
Sum of poission is poisson sum of lambda.
* If <math>X_i \sim Poisson(\lambda_i)</math> then <math>\sum X_i \sim Poisson(\sum \lambda_i)</math>


===Normal Distributions===
===Normal Distributions===