80% of our students are above average
In Lake Wobegon all the women are strong, all the men are good looking, and all the children are above average. We laugh because it is impossible for everybody to be above average. It is quite possible, however, for 80% of the population to be above average. Take ten people two of whom die at birth and eight die on their hundredth birthdays. In our sample the average life expectancy is 80, and 80% live longer than average. Even if our two unfortunates live until they are 99, 80% still live longer than average. So for any fraction, p%, other than 0% or 100% it is entirely possible for “p% of the population to be taller /shorter/ fatter / thinner / longer lived / or… than average.”
Recent comments on Chris Triggs’s posts