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. Note 1

Part A:	Fair Allocations
Part B:	Unfair Allocations
Part C:	Using Line Plots
Part D:	Deviations from the Mean
Part E:	Measuring Variation
Homework

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

Throughout the session you will be prompted to view short video segments. In addition to these excerpts, you may choose to watch the full-length video of this session.

Previously Introduced:

New in This Session:

line plot
median
variation

allocation
deviation from the mean
equal-shares allocation
mean
mean absolute deviation (MAD)
standard deviation
variance

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Session 5: Index | Notes | Solutions | Video