Why your classes are larger than average

When you were in college, did you ever wonder why your classes were usually larger than the “average” class size advertised in the brochures?

When you are sitting in traffic, have you ever thought that maybe if just a few more people carpooled that no one would need to be stuck with so many cars on the road?

Here, you can listen to David Hemenway explaining an interesting stats trick that addresses both of these phenomena, as well as many others.

To see the idea in print, check out this article in Mathematics Magazine.