Choosing the best measure of center (mean or median) means you must already be able to find a mean (add ÷ count), find a median (order, take the middle), and spot a number that is way bigger or smaller than the rest. Warm up those feeders first.
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 The average: add all the numbers, then divide by how many there are.
Example: For 2, 4, 6 the mean is 4 (12 ÷ 3).
Level 1 The middle number when you put the list in order.
Example: In 3, 5, 9 the median is 5.
Level 1 To line up numbers from smallest to biggest.
Example: Put 3, 9, 5 in order: 3, 5, 9.
Level 1 To look at numbers and see which is bigger or smaller.
Example: Compare 4, 5, 6, 40: the 40 is much bigger than the rest.
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 the mean of 2, 4, 6? (Add, then divide by 3.)
2. What is the median of 3, 9, 5? (Order first.)
3. In the list 4, 5, 6, 40, which value is far bigger than the rest?
Vocabulary previewed and basics checked. Time to start the lesson.
Start Lesson 8-4 →