1. Data Analysis
Supporting Idea

2. The Measures of Central Tendency

3. Find the Mean Divide by the number of entries in the data set
Add up all of the values in the data set
Check your sum
Divide by the number of entries in the data set

4. Find the Mean 8

5. Find the Median
LINE UP all the values from least to greatest
Be sure to include duplicates
Count pairs from each outside edge until you reach the center

6. Find the Median
When the number of items in the data set is odd, there is always a middle
5, 7, 9, 9, 12, 24, 27, 31, 32
12 is the middle
5, 7, 9, 9, 13, 24, 27, 31, 32, 33
5, 7, 9, 9, 12, 24, 27, 31, 32, 33
12+ 24 2
When the number of items in the data set is even, find the mean of the center two values!
36÷ 2 = 18; 18 is the middle

7. Find the Median 3

8. Find the Mode LINE UP all the values from least to greatest
Count the number of occurrences of each number
The mode is the value that appears most often

9. There could be MULTIPLE Modes
Find the Mode
There can be NO Mode
5, 7, 9, 10, 12, 24, 27, 31, 32
Each number appears only once! There is no mode.
There could be ONE Mode
5, 7, 9, 10, 12, 24, 27, 27, 32
The number 27 appears twice! It is the mode.
The numbers 9 and 27 appear twice! They are both modes.
5, 7, 9, 9, 12, 24, 27, 27, 32
There could be MULTIPLE Modes

10. Find the mode of the test grades shown below:
85 & 100

11. Greatest minus least = range
Find the Range
Think of the golf range! How far will the ball go? How far does the data spread?
Greatest minus least = range

12. Find the Range 35

13. Mixed Problem Solving H

14. Mixed Problem Solving B

15. Mixed Problem Solving I

16. Mixed Problem Solving B

17. Mixed Problem Solving 85

18. Mixed Problem Solving H

19. Mixed Problem Solving 2

20. Mixed Problem Solving D

21. Mixed Problem Solving H

22. Mixed Problem Solving 29

23. Mixed Problem Solving D

24. Mixed Problem Solving 39

25. Data Analysis
Supporting Idea
Keep Practicing!