And just so I get a positive value, I'm going to square it. And then I'm going to divide by the number of data points that I have. So essentially, I'm going to find the average squared distance. 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.