Poisson Command

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}.