6. Fish law
When the probability p of obtaining a defective part is low, the pseudo-curve representing Bernoulli's law has a characteristic appearance: the probability of finding zero or a very small number of defective parts in the sample is high (figure
7
). A simpler, single-parameter law leads to the same numerical values as Bernoulli's law: this is Poisson's law. It is defined by :
ν is called the parameter of the Poisson distribution.
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