This just shows that everyone thinks the live in Lake Woebegone, where every child is above average.
I remember thinking when shrubbia was "re-elected" just how much I had misunderestimated the average ability of people to make intelligent decisions.
This effect is obviously a large part of the problem with why incompetent people get elected.
Ah well.
Take your perceived ability, subtract 50% and triple the result ...
Enjoy.