[#mp_units-poisson_distribution-098-mean]
= xref:mp_units.adoc[mp_units]::xref:mp_units/poisson_distribution-098.adoc[poisson_distribution]::mean
:relfileprefix: ../../
:mrdocs:

Returns the distribution parameter `mean.`

== Synopsis

Declared in `<bits/random.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
double
mean() const;
----


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