1. Check for Understanding 0506.5.6
Mean and Median
Check for Understanding
   

2. MEAN
The mean is a synonym for average.

3. MEAN
To find the mean (average) of a group of numbers the first step is to add all of the numbers.
Example: 4, 10, 3, 7, 2, 10
= 36

4. MEAN
After you have added all of the numbers, the next step is to divide the sum by the total number of addends.
Example:
36/6 = 6
Mean = 6

5. MEAN
Note: sometimes, you do not get a whole number.

6. MEAN
Now, you try one!
7, 9, 11, 6, 13, 6, 6, 3, 11
What is the first step?

7. MEAN
= 72
What is the next step?

8. MEAN
Divide
72/9 = 8
Mean = 8
Now, let’s try 1 more!

9. Find the mean for this group of numbers.
11, 10, 24, 16, 14

10. MEAN
= 75

11. MEAN
75/5 = 15
Mean = 15

12. MEDIAN
The median is the middle number or value.
To find the median the first step is to put the numbers in order from least to greatest.

13. MEDIAN
The number in the middle of the list is the median.

14. MEDIAN
4, 23, 16, 17, 6, 10, 20
Put the numbers in order from least to greatest.

15. MEDIAN
4, 6, 10, 16, 17, 20, 23
Median = 16

16. MEDIAN
Now you try one!
What is the median of
5, 11, 23, 9, 10

17. MEDIAN
5, 9, 10, 11, 23
Median = 10

18. MEDIAN
6, 3, 7, 6, 11, 13, 6, 11, 9
Put the numbers in order from least to greatest.

19. MEDIAN
3, 6, 6, 6, 7, 9, 11, 11, 13
Median = 7

20. MEDIAN
If there are two middle values, the median is halfway between them.

21. MEDIAN
13, 7, 6, 8, 6, 3, 11, 6, 11, 9
Put the numbers in order

22. MEDIAN
3, 6, 6, 6, 7, 8, 9, 11, 11, 13
There are two middle numbers or values, 7 and 8. The median is halfway between 7 and 8. The median is 7 ½ or 7.5.