It’s intended to be obvious nonsense as a means of getting people to think about metrics and whether the sum of a metric over a population is a good metric for

It’s intended to be obvious nonsense as a means of getting people to think about metrics and whether the sum of a metric over a population is a good metric for that population. The same thing goes for means, weighted means, and so forth. The classic joke being that when Bill Gates walks into a homeless shelter, everyone is a millionaire on averages.