So 7 over 3 squared, minus the mean of the x squared, so it's going to be minus this 7 right over here. And now we just have to do a little bit of mathematics here. I'm tempted to get out my calculator, but I'll resist the temptation. It's nice to keep things as fractions. So let's see if I can calculate this. So this is going to be equal to, this is 14 over 3, 14 over 3 minus 16 over 3, all of that over, this is 49, 49 over 9, right? 7 thirds squared is 49 over 9.