Session 2: What Is Typical? The Mean
Learn to calculate the average (mean) and understand what 'typical' looks like in a dataset. Discover when the average can mislead.
Your Progress
Learning Objectives
By the end of this session, you will be able to:
- Calculate the mean (average) of a dataset
- Explain what the mean tells you about a group
- Identify situations where the mean is misleading
- Use the mean to make comparisons between groups
Why This Matters
The average is the most commonly used number in data. Understanding what it really means — and when it lies — gives you a critical thinking edge.
Session Lessons
What Is the Average?
Learn what the mean is, how to calculate it, and what it tells you about a group.
~30 minutes Activity
When the Average Lies
Discover how extreme values (outliers) can pull the mean away from what is truly typical.
~30 minutes Discussion
Comparing Groups With Averages
Use the mean to compare two groups fairly. Learn what a meaningful difference looks like.
~30 minutes Activity
Averages in the Real World
Explore how averages are used (and misused) in sports, school, weather, and daily life.
~30 minutes Activity