This Instructional Activity is a part of the Lesson 18, Unit 6, Grade 6. Review dot plots and histograms. Important points that should be included in the review include the following: Dot plots and histograms are both graphical displays of a data distribution. You can learn a lot from looking at a graphical display of a data distribution. In particular, you can get a sense of what a typical value is and how much the data values tend to differ from one another. Numerical summary measures (such as the mean and MAD or the median and the IQR) complement graphical displays.