And so this is going to be equal to, let me give myself a little bit more real estate, the unbiased sample variance. And I could even denote it by this to make it clear that we're dividing by lowercase n minus 1 is going to be equal to, let's see, 4 minus 6 is negative 2. That squared is positive 4. So I did that one. 3 minus 6 is negative 3. That squared is going to be 9. 5 minus 6 squared is 1 squared, which is 1.