User blog comment:Wildoneshelper/Poll on difficulty approach/@comment-24044003-20131031001445/@comment-4189499-20131031111635

However, if one IP want's to vote vandalously on a poll, it won't make much difference. They only have one vote, and as long as there is a large enough sample of people, the other votes will balance theirs out. That's why statisticians look for values like the mean, median and mode when looking at data; it's to stop the outliers (such as those who vote stupidly on levels) from making big impacts on the results. Also, that's why I support looking at the median when determining the score to use if we must go with difficulty. It is less affected by outliers than the average (also known as mean) which means you will be given a more reflective result despite one or two vandals who might come amongst the many people wishing to do the right thing, IPs and registereds alike. Of course, the best thing to do would be delete the difficulty altogether because then there would be no difficulty to vandalise, but if it must stay, it shouldn't be restricted to certain users. That's only fair, don't you think?