Poisson Command
- Poisson( <Mean> )
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Returns a bar graph of a Poisson distribution with given mean λ.
- Poisson( <Mean>, <Boolean Cumulative> )
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Returns a bar graph of a Poisson distribution when Cumulative = false. Returns a graph of a cumulative Poisson distribution when Cumulative = true. The first parameter is same as above.
- Poisson( <Mean>, <Variable Value v>, <Boolean Cumulative> )
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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.
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Poisson(3, 1, true)yields 0.2 in the
Algebra View and \(\frac{4}{e³}\) in the 
CAS View. -
Poisson(3, 1, false)yields 0.15 in the Algebra View and \(\frac{3}{e³}\) in the CAS View.
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A simplified syntax is available to calculate P(u ≤ X ≤ v): e.g. |