So this is the variance of our original distribution. Now, to show that this is the variance of our sampling distribution of our sample mean, we'll write it right here. This is the variance of our mean, of our sample mean. Remember, the sample, our true mean is this, that the Greek letter mu is your true mean. This is equal to the mean, while an X with a line over it means sample mean. Sample mean. So here, what we're saying is this is the variance of our sample means.