Well, that's, I guess, interesting. But now I want to ask another question. I want to get some measure of how much spread there is around that mean, or how much do the data points vary around that mean? And obviously, I can give someone all the data points. But instead, I actually want to come up with a parameter that somehow represents how much all of these things, on average, are varying from this number right here. Or maybe I will call that thing the variance. And so what I do, so the variance, and I will do, and this is a population variance that I'm talking about, just to be clear.