[RangerScience]

Right, but number of hands and fingers doesn't form a bell curve in the first place.

[AstralStorm]

Grades don't either, their composite is at most beta distributed and probably not even that.

First of all, finite. There is a minimum and maximum. Second, questions tend to be internally correlated. (After all, they correspond to subjects.)

Third, students are not expected to be average but pass all the questions.