parameters: (self, concentration=None, rate=None)
return_statement: return concentration / rate
docstring: The mean of the distribution.
docstring_summary: The mean of the distribution.
docstring_tokens: The mean of the distribution .
function: def _mean(self, concentration=None, rate=None):
          """
          The mean of the distribution.
          """
          concentration, rate = self._check_param_type(concentration, rate)
          return concentration / rate
function_tokens: def _mean ( self , concentration = None , rate = None ) : concentration , rate = self . _check_param_type ( concentration , rate ) return concentration / rate