1. Mean, Median, and Mode
Lesson 7-1

2. I can… Self Assessment Find the mean of a set of numbers
Find the median of a set of numbers
Find the mode of a set of numbers
Find the range of a set of numbers
Self Assessment
5- I can do it without help & teach others.
4- I can do this with no help, but I don’t know if I can explain it.
3- I can do this with a little help.
2- I can do this with a lot of help!
1- I don’t have a clue.

3. Mean, Median, Mode & Range
Hey diddle diddle the median’s in the middle
You have to add and divide for the mean
The mode is the one that appears the most
And the range is the difference between.

4. Mean The mean of a set of data is the average. Add up all of the data.
Divide the sum by the number of data items you have.

5. 4, 16, 20, 40 Find the mean First, add. 4 + 16 + 20 + 40 = 80
There are 4 items. Divide the sum (80) by 4.
The mean is 20.

6. Median
The median is the data point that is in the middle when the data is listed in order.
If there are two numbers in the middle (an even number of items), then find the mean of the two middle numbers.

7. 13, 16, 17, 19, 25 3, 5, 6, 9 Find the median 17 is the median.
Here, the 5 and 6 are both in the middle = divided by 2 = The median is 5.5.

8. Mode The mode is the data item that appears the most.
If all data items appear the same number of times, then there is no mode.

9. Find the mode
5, 4, 6, 11, 5, 7, 10, 5
The mode is 5.

10. Range
The range is the difference between the highest number and the lowest number.

11. Find the range
5, 4, 6, 11, 5, 7, 10, 5
11 – 4 = 7

12. Use the given mean to find the missing number.
Find the missing addend
Use the given mean to find the missing number.
Remember… We work backwards
If the mean is $4
$1, $3, $5, ___

13. How to Find the missing ADDEND if you know the mean.
Step 1 – Multiply the mean times the TOTAL number of addends.
If the mean is $4
$1, $3, $5, ___
$4 X 4 = $16

14. How to Find the missing ADDEND if you know the mean.
Step 2 – Subtract the KNOWN addends from the total.
If the mean is $4
$1, $3, $5, ___ $7
$16 - $1 - $3 - $5 = $7

15. How to Find the missing ADDEND if you know the mean.
Step 1 – Multiply the mean times the number of TOTAL addends
If the mean is 13
12, 15, 18, 10,__
13X 5 = 65

16. How to Find the missing ADDEND if you know the mean.
Step 2 – Subtract the KNOWN addends from the total.
If the mean is 13
12, 15, 18, 10, __ 10
– 15 – 18 – 10 = 10

17. Find the missing ADDEND.
Your Turn…
Find the missing ADDEND.
Remember… We work backwards
If the mean is 10
5, 7, 10, 13, __ 15

18. I can… Self Assessment Find the mean of a set of numbers
Find the median of a set of numbers
Find the mode of a set of numbers
Find the range of a set of numbers
Self Assessment
5- I can do it without help & teach others.
4- I can do this with no help, but I don’t know if I can explain it.
3- I can do this with a little help.
2- I can do this with a lot of help!
1- I don’t have a clue.

19. in your math notebook Daily Check 2.8 18, 22, 13, 15, 28, 10, 13
Find the mean, median, mode(s), and range of the data.
18, 22, 13, 15, 28, 10, 13
80, 84, 95, 84, 98, 98, 94 71