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# std::poisson_distribution::mean

From cppreference.com
< cpp‎ | numeric‎ | random‎ | poisson distribution

double mean() const; |  | (since C++11)

Returns the μ parameter the distribution was constructed with. The parameter defines mean number of occurrences of the event. The default value is 1.0.

### [edit] Parameters

(none)

### [edit] Return value

Floating point value identifying the μ distribution parameter.

### [edit] See also

param | gets or sets the distribution parameter object (public member function) [edit]

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