Mean absolute deviation measures how far each value sits from the mean. To do it you find a mean (add ÷ count), then subtract to get each distance, then average those distances. So subtraction, addition, and division all need to be warm.
These are words you'll need to already know to follow this lesson — not the new words the lesson teaches. Review each one, its meaning, and the example so the new lesson makes sense from the start.
Level 1 To take one number away from another.
Example: 9 − 5 leaves 4.
Level 1 How far apart two numbers are, always a positive amount.
Example: The distance between 7 and 10 is 3.
Level 1 To put numbers together to find the total.
Example: 2 + 4 + 6 adds up to 12.
Level 1 To split a total into equal groups.
Example: 8 ÷ 4 = 2.
These check the skills you'll need for this lesson — not the new lesson itself. Answer all 3, then press Show my path. No grade — it just suggests where to start.
1. What is 9 − 5?
2. How far apart are 7 and 10 on a number line?
3. What is 8 ÷ 4?
Vocabulary previewed and basics checked. Time to start the lesson.
Start Lesson 8-3 →