Original quote by George Carlin, not US-centric: “Think of how stupid the average person is, and realize half of them are stupider than that.”
I take it confusing the arithmetic average for the median is part of the joke?
Intelligence is not inherently quantifiable. IQ is an arbitrary way to quantify it, but there average and median is pretty much equal by definition.
IQ roughly follows a Gaussian distribution, so median and average are the same here.
IQ is normally distributed, so the two are the same.
"The average person" typically means the median person.
Carlin had no father and you can tell.