This Problem Set is a part of the Lesson 21, Unit 6, Grade 6. Given a data set, students describe the data distribution using the mean and mean absolute deviation (MAD) or the median and the interquartile range (IQR). This lesson provides an opportunity for students to summarize a given data set. As students work through this lesson, have them think about how what they are doing applies to the data that they have collected for their projects.