So that's going to be right over here. So y is equal to 1 4th is going to be right over, this is 1 half, so right over here. So this is our mean y, let me draw it a little bit neater than that, this is our mean y value. This is our mean y value, or the central tendency for our y values. And so what we calculated next was the total error, the squared error from the means of our y values. That's what we calculated over here. This is what we calculated over here in the spreadsheet.