0.568. Let's also figure out our sample variance, because we can use it later for building our confidence interval. Our sample variance here, we're going to take the weighted sum of the squared differences from the mean and divide by this minus 1. 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.