The smaller this is, that means the tighter the range, just to use the word itself, of the numbers actually are. So that's the range. The mid-range is one way of thinking, to some degree, of kind of central tendency. So mid-range. And what you do with the mid-range is you take the average of the largest number and the smallest number. So here we took the difference, that's the range. The mid-range would be the average of these two numbers.