And I know I just used the word mean twice in a sentence, so it might be a little confusing. But as we work through it, hopefully it'll make a little bit of sense. So how much does Manuela's, the number of bubbles she blew, how much does that deviate from the mean? Well, Manuela actually blew four bubbles, and four is the mean. So her deviation, her absolute deviation from the mean is 0. How much did, actually let me just write this over here. So absolute deviation.