ABSTRACT
If λ is the expectation of the occurrence of an event then the probability of 0, 1, 2, 3, …. occurrences is given by: e − λ , λe − λ , λ 2 e − λ 2 ! , λ 3 e − λ 3 ! , … https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780429294402/968186b9-ffa4-4f2b-aa54-7fc58a604561/content/eq6282.tif"/>
