I once read a tale about a bureaucrat that was assigned to sizing military garb. He went out and measured everybody, he even did so accurately, to a tenth. He then used the mean average. Turns out very few people are actually 5'9" with a size 9 foot and etc...

But if we really look at the human space, I'm pretty sure in terms of education nothing actually fits, except compliance and the willingness to accept highwaters and blisters.