# std::poisson_distribution::mean

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< 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.

### Parameters

(none)

### Return value

Floating point value identifying the μ distribution parameter.

### See also

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

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