Now, one way, this is kind of the most simple way, is the range, and you won't see it used too often, but it's kind of a very simple way of understanding how far is the spread between the largest and the smallest number. And literally, take the largest number, which is 30 in our example, and from that you subtract the smallest number. So 30 minus negative 10, which is equal to 40, which tells us that the difference between the largest and the smallest number is 40. So we have a range of 40 for this data set. Here, the range is the largest number, 12, minus the smallest number, which is 8, which is equal to 4. So here, range is actually a pretty good measure of dispersion. We say, OK, both of these guys have a mean of 10, but when I look at the range, this guy has a much larger range.