We have four different gum chewers, and they tell us how many bubbles each of them blew. So what I want to do is I want to figure out first the mean of the number of bubbles blown, and then also figure out how dispersed is the data. How much do these vary from the mean? And I'm going to do that by calculating the mean absolute deviation. So pause this video now. Try to calculate the mean of the number of bubbles blown. And then after you do that, see if you can calculate the mean absolute deviation.