## Join us for conversations that inspire, recognize, and encourage innovation and best practices in the education profession.

**Available on Apple Podcasts, Spotify, Google Podcasts, and more.**

In Session 4, we explored the Five-Number Summary and its graphical representation, the box plot. We also explored the median, a common numerical summary for a data set.

In this session, we’ll investigate another common numerical summary, the mean. We’ll also learn several ways to describe the degree of variation in data, based on how much the data values vary from the mean. See Note 1.

You will need to have these materials in hand before you begin:

- 45 coins
- calculator
- several pieces of blank paper or 22″ by 28″ poster board
- self-adhesive colored dots or 2″ by 1.5″ adhesive notepaper squares

In this session, you will do the following:

- Understand the mean as an indicator of fair allocation
- Explore deviations of data values from the mean
- Understand the mean as the “balancing point” of a data set
- Learn how to measure variation about the mean

Previously Introduced:

New in This Session:

allocation

deviation from the mean

equal-shares allocation

mean

mean absolute deviation (MAD)

standard deviation

variance