So let's calculate the grand mean. So it's going to be 3 plus 2 plus 1, 3 plus 2 plus 1, plus 5 plus 3 plus 4, plus 5 plus 3 plus 4, plus 5 plus 6 plus 7. Plus 5 plus 6 plus 7. And then we have 9 data points here. We have 9 data points, so we'll divide by 9. And what is this going to be equal to? 3 plus 2 plus 1 is 6.