And then 5 plus 6 plus 7 is 18. And then 6 plus 12 is 18, plus another 18 is 36. Divided by 9 is equal to 4. Let me show you that that's the exact same thing as the mean of the means. So the mean of this group 1 over here, let me do it in that same green. The mean of group 1 over here is 3 plus 2 plus 1, that's that 6 right over here, divided by 3 data points. So that will be equal to 2.