And then the mean of group 3, 5 plus 6 plus 7 is 18, divided by 3 is 6. So if you were to take the mean of the means, which is another way of viewing this grand mean, you have 2 plus 4 plus 6, which is 12, divided by 3 means here, and once again you would get 4. So you could view this as the mean of all of the data in all of the groups, or the mean of the means of each of these groups. But either way, now that we've calculated it, we can actually figure out the total sum of squares. So let's do that. So it's going to be equal to 3 minus 4, the 4 is this 4 right over here, squared, plus 2 minus 4 squared, plus 1 minus 4 squared, now I'll do these guys over here in purple, plus 5 minus 4 squared, plus 3 minus 4 squared, plus 4 minus 4 squared, let me scroll over a little bit, plus 4 minus 4 squared, now we only have 3 left, plus 5 minus 4 squared, plus 6 minus 4 squared, plus 7 minus 4 squared. And what does this give us?