And if you're dealing with units, let's say if these are each negative, well, let's say they're distances. So this is negative 10 meters, 0 meters, 10 meters, this is 8 meters, so on and so forth. Then when you square it, you get your variance in terms of meters squared. It's kind of an odd set of units. So what people like to do is talk in terms of standard deviation. Which is just the square root of the variance. It's just the square root of the variance.