And what's the variance of this distribution? And we came up with that result in the last video. If we're taking essentially the difference of two random variables, the variance is going to be the sum of those two random variables. And the whole point of that video is to show you that, hey, it's not the difference of the variances. It's the sum of the variances. So the variance of this new distribution, and I haven't drawn the distribution yet, the variance of this new distribution, I'll just write x bar minus y bar, is going to be equal to the sum of the variances of each of these distributions. The variance of x bar plus the variance of y bar.