This 25-slide PowerPoint presentation describes what Mean Absolute Deviation is and how to calculate it. The lesson uses two sets of sample data that turn out to have the same mean & median and a common range. Mean absolute deviation is introduced as another measurement that will show the difference in the two data sets. The presentation is designed to have students work with the sample data as well so they can learn as they go along. Content is based on common core standard CCSS.Math.Content.6.SP.B.5 under the domain of statistics and probability. This presentation could take up most of a class period depending on how much you involve students. Individual students can use it for remediation or if they just missed the lesson.