They do track median and 25th/75th percentiles.

Do you have a link? There's no obvious place to look for this. All I can find is "Median usual weekly earnings of full-time wage and salary workers by sex, quarterly averages, seasonally adjusted". Which is not trivial to extrapolate into a real annual wage. And it's not clear how "quarterly averages" and "median usual weekly earnings" compose....

Old joke: Bill Gates walks into a bar. On average everyone there is a millionaire

I more like my high school math teacher explanation: "Put your one hand on dry ice, another in the boiling water. On average, you feel warm and cozy"

Except dry ice is -100 and boiling water is 200 so you feel hot and not cozy.

You're just adding the temperatures, you then need to divide by 2 to get the average - so it's actually 51.35 fahrenheit (10.75 celsius).

That's a really old joke. :)

Here's a new one. Musk goes to a concert. On average everyone there is a billionaire.