Now, that might sound very complicated, but let's actually work it out. So I'll take my first data point. I'll take that data point, and I will subtract our mean from it. So this is going to give me a negative number, but if I square it, it's going to be positive. So it's essentially going to be the squared distance between 1 and my mean. And then to that, I'm going to add the squared distance between 3 and my mean. And to that, I'm going to add the squared distance between 5 and my mean.