The mean is the total ÷ how many numbers, the median is the middle of an ordered list, and the mode is the most common value. So you need three feeder skills warm: adding a list, dividing, and ordering numbers least to greatest.
Answer these 3, then press Show my path. No grade — this just points you to the right level.
1. What is 2 + 4 + 6?
2. What is 12 ÷ 3?
3. Put in order least to greatest: 5, 2, 8. Which is the middle number?
Mean = add all the numbers, then divide by how many there are. Median = order the numbers, then take the middle. Mode = the value that appears most. All three start with these basics.
Your quick check picks one for you, but you can switch any time:
Level 0 One small step at a time.
A. Add the list: 3 + 3 + 3 = ___
3 + 3 = 6, then 6 + 3 = 9.
B. There are 3 numbers and the total is 9. What is 9 ÷ 3 (the mean)?
9 ÷ 3 = 3.
C. Order least to greatest: 4, 1, 2. The middle number is ___
Ordered: 1, 2, 4. The middle one is 2.
Level 1 Find totals, then the mean.
A. Add: 2 + 5 + 5 = ___
2 + 5 = 7, then 7 + 5 = 12.
B. The total is 12 and there are 4 numbers. What is the mean (12 ÷ 4)?
12 ÷ 4 = 3.
C. In the list 6, 2, 6, 9, which value is the mode (most common)?
6 appears twice; every other number appears once.
Level 2 Compute a mean and a median start to finish.
A. Find the mean of 4, 8, 6: add them, then divide by 3.
4 + 8 + 6 = 18, and 18 ÷ 3 = 6.
B. Find the median of 9, 4, 7, 2, 5 (order first, take the middle).
Ordered: 2, 4, 5, 7, 9. The middle of 5 numbers is the 3rd → 5.
1. What is the mean of 3, 5, 7? (Add, then divide by 3.)
3 + 5 + 7 = 15, and 15 ÷ 3 = 5.
2. What is the median of 8, 2, 6? (Order first, take the middle.)
Ordered: 2, 6, 8. Middle = 6.
You've practiced exactly what Lesson 8-2 uses. Time to dive in.
Start Lesson 8-2 →