# Difference between revisions of "Poisson Command"

From GeoGebra Manual

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:Returns P( X ≤ ''v'') when ''Cumulative'' = true. | :Returns P( X ≤ ''v'') when ''Cumulative'' = true. | ||

:First parameter is same as above. | :First parameter is same as above. | ||

− | ==CAS | + | ==CAS Syntax== |

;Poisson[ <Mean λ>, <Variable Value v>, <Boolean Cumulative> ] | ;Poisson[ <Mean λ>, <Variable Value v>, <Boolean Cumulative> ] | ||

:Let X be a Poisson random variable. | :Let X be a Poisson random variable. |

## Revision as of 12:24, 26 January 2013

- 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}*.