Copied and adapted introductory text from w:Probabilistic voting model (revision: https://en.wikipedia.org/w/index.php?title=Probabilistic_voting_model&oldid=1042993015 )
(Copied and adapted introductory text from w:Probabilistic voting model (revision: https://en.wikipedia.org/w/index.php?title=Probabilistic_voting_model&oldid=1042993015 ))