Poisson Command

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Poisson[ <Mean λ> ]
Returns a bar graph of a Poisson distribution with given mean λ.
Poisson[ <Mean λ>, <Boolean Cumulative> ]
Returns a bar graph of a Poisson distribution when Cumulative = false.
Returns a bar graph of a cumulative Poisson distribution when Cumulative = true.
The first parameter is same as above.
Poisson[ <Mean λ>, <Variable Value v>, <Boolean Cumulative> ]
Let X be a Poisson random variable.
Returns P( X = v) when Cumulative = false.
Returns P( X ≤ v) when Cumulative = true.
First parameter is same as above.

CAS Syntax

Poisson[ <Mean λ>, <Variable Value v>, <Boolean Cumulative> ]
Let X be a Poisson random variable.
Returns P( X = v) when Cumulative = false.
Returns P( X ≤ v) when Cumulative = true.
First parameter is same as above.
Examples:

Poisson[3, 1, true] yields \frac{4}{e³}.

Poisson[3, 1, false] yields \frac{3}{e³}.
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