And we get 0 plus 1 plus 2 plus 3 is 6 over 4, which is the same thing as 1 and 1 half. Or let me just write it in all the different ways. We could write it as 3 halves or 1 and 1 half or 1.5, which gives us a measure of how much do these data points vary from the mean of 4. Now I know what some of you are thinking. Wait, I thought there was a formula associated with the mean absolute deviation. And it seems really complex. It has all of these absolute value signs and whatever else.