stats_cdf_poisson
  Calculates any one parameter of the Poisson distribution given values for the others.
  
 
  Description
  
   float stats_cdf_poisson
    ( float $par1
   , float $par2
   , int $which
   )
  WarningThis function is
currently not documented; only its argument list is available.
 
  
 
  Parameters
  
   
    
     - 
par1
- 
      
       
- 
par2
- 
      
       
- 
which
-