And so it's one way of measuring the central tendency, or the average, I guess we could say. So this is our mean. We want to average 23 plus 29. Or we want to sum 23 plus 29 plus 20 plus 32 plus 23 plus 21 plus 33 plus 25. And then divide that by the number of numbers. So we have 1, 2, 3, 4, 5, 6, 7, 8 numbers. So you want to divide that by 8.