We can get the best estimator of the true variance. It's 1 times 142 samples that were 1 minus 0.568 away from our sample mean. We're this far from the sample mean 142 times, and we're going to square those distances. Plus the other 108 times, we got a 0, so we were 0 minus 0.568 away from the sample mean. Then we are going to divide that by the total number of samples minus 1. That minus 1 is our adjuster so that we don't underestimate. 250 minus 1, let's get our calculator out again.