And we have 3 of these xy's, so divided by 3. So what's this going to be equal to? 2 plus 2, which is 4, 4 plus 12, which is 16. So it's going to be 16 over 3. Did I get that right? 4 plus 12, yep, 16 over 3. And then the last one we have to calculate is the mean of the x squareds.