For this first group, how much variation for each of these guys is due to the variation between this mean and the mean of means? Well, it's going to be, so for this first guy up here, I'll just write it all out explicitly, the variation is going to be its sample mean. So it's going to be 2 minus the mean of means squared. And then for this guy, it's going to be the same thing. His sample mean, 2 minus the mean of means squared plus, same thing for this guy, 2 minus the mean of means squared. Or another way to think about it, this is equal to 3 times 2 minus 4 squared, which is the same thing as 3. This is equal to 3 times 4 is equal to 12.