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Calculation of Poisson distribution

There is an average of tree accidents in a week, what is the probability of exactly four accidents in a wek

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First, the Poisson Distribution describes events which have a small probability of occurrence at any very precise single value, like 3.546732190, but which nonetheless occur very very frequently in a range of values. Also the mean or average or expected value are the same as the variance, in your case, three (I think you meant three).

So looking up the tables for this (or plugging it in Excel) the prob x=4 exactly is 0.1680

Posted on Mar 23, 2014

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