1. Mean, Median, Mode and Range
By Miss Setchell

2. Definitions Mean – Average Median – Middle number
Mode – Number seen the most often
Range – Difference between the highest and lowest number
Sum – The answer to an addition problem
Addend – The numbers you added together to get the sum

3. Finding the mean is like evening out the numbers.
2, 5, 2, 1, 5

4. Finding the mean is like evening out the numbers.
2, 5, 2, 1, 5

5. Finding the mean is like evening out the numbers.
2, 5, 2, 1, 5
mean = 3

6. How to Find the Mean of a Group of Numbers
Step 1 – Add all the numbers.
8, 10, 12, 18, 22, 26
= 96

7. How to Find the Mean of a Group of Numbers
Step 2 – Divide the sum by the number of addends.
8, 10, 12, 18, 22, 26
= 96
How many addends are there?

8. How to Find the Mean of a Group of Numbers
Step 2 – Divide the sum by the number of addends. 1 6 6) 96
# of addends
sum 6 3 6 3 6

9. What is the Mean of this set of numbers?
The mean or average of these numbers is 14.
8, 10, 12, 18, 22, 26

10. What is the Mean of this set of numbers?
The mean or average of these numbers is 15.
9, 11, 13, 20, 24

11. Median
– the middle number in a set of ordered numbers.
1, 3, 7, 10, 13
Median = 7

12. How to Find the Median in a Group of Numbers
Step 1 – Arrange the numbers in order from least to greatest.
21, 18, 24, 19, 27
18, 19, 21, 24, 27

13. How to Find the Median in a Group of Numbers
Step 2 – Find the middle number.
21, 18, 24, 19, 27
18,
19,
21,
24, 27

14. How to Find the Median in a Group of Numbers
Step 3 – If there are two middle numbers, find the mean of these two numbers.
18, 19, 21, 25, 27, 28

15. How to Find the Median in a Group of Numbers
Step 3 – If there are two middle numbers, find the mean of these two numbers. 46 =
median 23 2) 46

16. What is the median of these numbers?
16, 10, 7 7,
10, 16

17. What is the median of these numbers?
18, 23, 8, 14, 6, 27 6, 8,
14,
18,
23, 27
Median is 16

18. What is the Mode of a group of numbers?
-The number that occurs the most often
22, 13, 24, 12, 12, 23, 12

19. What is the Mode of a group of numbers?
Step 1 – Put the numbers in order from least to greatest.
22, 13, 24, 12, 12, 23, 12
12,
12,
12,
13,
22,
23, 24

20. What is the Mode of a group of numbers?
Step 2 – Find the number that occurs the most often.
12,
12,
12,
13,
22,
23, 24

21. What is the Mode of a group of numbers?
- 12 is the number that occurs most often.
12, 12
12,
12,
- 12 is the Mode.

22. What is the Mode of this group of numbers?
The Mode is 15.
14, 15, 12, 11, 24, 15, 23

23. What is the Mode of this group of numbers?
The Mode is 35.
35, 21, 56, 35, 23, 14, 12

24. What is the Mode of this group of numbers?
There is no number that occurs more than once.
16, 12, 18, 29, 36, 11, 10
So, there is no Mode for this group of numbers.

25. Range
– the difference between the greatest and the least value in a set of numbers.
1, 1, 3, 7, 10, 13
13-1= __
Range = 12

26. How to Find the Range in a Group of Numbers
Step 1 – Arrange the numbers in order from least to greatest.
21, 18, 24, 19, 27
18, 19, 21, 24, 27

27. How to Find the Range in a Group of Numbers
Step – Find the lowest and highest numbers.
18, 19, 21, 24, 27

28. How to Find the Range in a Group of Numbers
Step 3 – subtract the lowest number from the highest number. 18
27 – 18 = ___
, 19, 21, 24, 27
The Range is 9.

29. What is the range?
29, 8, 4, 8, 19
4, 8, 8, 19, 29
29 – 4 = 25
range

30. What is the range?
22, 21, 27, 31, 21, 32
21, 21, 22, 27, 31, 32
32 – 21 = 11
range

31. Review Mean – Average Median – Middle number
Mode – Number seen the most often
Range – Difference between the highest and lowest number
Sum – The answer to an addition problem
Addend – The numbers you added together to get the sum

32. Quiz
Find the Mean, Median, Mode and Range of this group of numbers:
3, 6, 4, 2, 7, 1, 8, 3, 5

33. 3, 6, 4, 2, 7, 1, 8, 3, 5 Mean- Median- Mode- Range-
Hint: Put the numbers in order from least to greatest before you begin.
Mean-
Median-
Mode-
Range-