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Lesson 1: What Is the Average?

About 30 minutes — Activity-based lesson

What You Will Learn

This lesson covers:

What 'average' means in everyday language vs. math

This section covers the key ideas about what 'average' means in everyday language vs. math. Discuss with your group or family and explore the concepts together.

How to calculate the mean: add all values, divide by how many

This section covers the key ideas about how to calculate the mean: add all values, divide by how many. Discuss with your group or family and explore the concepts together.

What the mean tells you: a typical or central value

This section covers the key ideas about what the mean tells you: a typical or central value. Discuss with your group or family and explore the concepts together.

Practice: calculate the mean of 5 different datasets

This section covers the key ideas about practice: calculate the mean of 5 different datasets. Discuss with your group or family and explore the concepts together.

Check Your Understanding

1. How do you calculate the mean?

Answer: Add up all the values, then divide by how many values there are. Example: 4+6+8+10+12 = 40. Divide by 5 values = mean of 8.

2. What does the mean tell you?

Answer: The mean gives you a 'typical' value for the group. It balances out the highs and lows to find the center.

3. Is the mean always a number in the dataset?

Answer: No! The mean can be a number that does not appear in the data at all. The average of 3, 5, and 7 is 5, but the average of 3, 5, and 8 is 5.33 — which is not in the data.

4. Why is the mean useful?

Answer: It lets you summarize a whole dataset with one number. Instead of listing all 30 test scores, you can say 'the average was 82.'

Key Takeaways

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