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. The mean of group 2, the sum here is 12, we saw that right over here. 5 plus 3 plus 4 is 12, divided by 3 is 4, because we have 3 data points. And then the mean of group 3, 5 plus 6 plus 7 is 18, divided by 3 is 6.