1. Mean, Median, Mode, Range, Outlier
Central Tendency
Mean, Median, Mode, Range, Outlier

2. Objectives
SPI Calculate measures of central tendency to analyze data.
Checks Evaluate how different measures of central tendency describe data.
Checks Identify outliers and determine their effect on mean, median, mode and range.
Find the mean, median, mode, range, and outlier in a data set.

3. Did You Know…
That you probably use statistics such as mean, median, mode and range almost every day without even realizing it?!?

4. Today We Will Learn… Mean Median Mode Range
And how to use these in everyday life, as well as the classroom!

5. What Do We Already Know?
Sure, the words “Mean, Median, Mode and Range” all sound confusing…
But what about the words we already know, like “Average, Middle, Most Frequent, and Difference”?
They are all the same ideas!

6. Teachers average your grades every 9 weeks
This is the same thing as finding the mean.

7. Video 18-00

8. Central Tendency Mean- (average) 1- add all of the scores together
2- count how many scores there are
3- Divide the sum by the # of scores
Median- (middle #)
1- Put all of the scores in order from least to greatest
2- If there are an odd number of scores, the median will be the # in the middle
3- If there is an even number of scores, find the mean of the 2 numbers in the middle.
Mode- (most often)
1- The mode is the number that appears most often in a set of data.
2- If all of the numbers only appear 1 time each, then there will be NO MODE. (*The answer will not be 0 because 0 is a number).
Range- (L to G)
1- Put all of the scores in order from least to greatest (* which you already do this to find the median)
2- What is the biggest #? What is the smallest #?
3- The range is the difference between the greatest # and least # in a set of data is the range.
Outlier- (a # that is just “out” on it’s own)
A number which is far removed from the other numbers in a data set.
Students paste these notes in journal and write down the examples for each found on the following slides.

9. Find the mean, median, mode, and range of 2,8,3,8,4
Mean- (Average)
1- add all of the scores together
2- count how many scores there are
3- Divide the sum by the # of scores
Show your work here:

10. There are 5 scores 25 ÷ 5 = 5 Mean = 5
Find the mean, median, mode, and range of 2,8,3,8,4
Mean- (Average)
1- add all of the scores together
2- count how many scores there are
3- Divide the sum by the # of scores
Example: = 25
There are 5 scores
25 ÷ 5 = 5
Mean = 5

11. Mean step by step basketball

12. 1- Put all of the scores in order from least to greatest
Find the mean, median, mode, and range of 2,8,3,8,4
Median- (Middle #)
1- Put all of the scores in order from least to greatest
2- If there are an odd number of scores, the median will be the # in the middle
3- If there is an even number of scores, find the mean of the 2 numbers in the middle.
Show your work here:

13. Find the mean, median, mode, and range of 2,8,3,8,4
Median- (Middle #)
1- Put all of the scores in order from least to greatest
2- If there are an odd number of scores, the median will be the # in the middle
3- If there is an even number of scores, find the mean of the 2 numbers in the middle.
Example
2,8,3,8, ,3,4,8,8
There is an odd # of scores, so the median is 4.
In order from
Least to Greatest

14. Find the mean, median, mode, and range of 2,8,3,8,4
Mode- (Most Often)
1- The mode is the number that appears most often in a set of data.
2- If all of the numbers only appear 1 time each, then there will be NO MODE. (*The answer will not be 0 because 0 is a number).
show your work here:

15. Find the mean, median, mode, and range of 2,8,3,8,4
Mode- (Most Often)
1- The mode is the number that appears most often in a set of data.
2- If all of the numbers only appear 1 time each, then there will be NO MODE. (*The answer will not be 0 because 0 is a number).
Example
2,3,4,8,8
Mode = 8 * if there had been 1 more 4 in this set of data the mode would have been 4 and 8.

16. Use what you just learned to Find the mean, median, and mode of the following data:
19, 5, 20, 19, 19, 18, 5, 19, 20

17. Use what you just learned to Find the mean, median, and mode of the following data:
19, 5, 20, 19, 19, 18, 5, 19, 20
in order from L to G: 5, 5, 18, 19, 19, 19, 19, 20, 20
mean= = 144
144 ÷ 9 = 16
median = 19 (the # in the middle)
mode= 19
Mean= Median= Mode = 19

18. Range- Find the mean, median, mode, and range of 2,8,3,8,4
1- Put all of the scores in order from least to greatest (* which you already do this to find the median)
2- What is the biggest #? What is the smallest #?
3- The range is the difference between the greatest # and least # in a set of data is the range.
Find the range here:

19. Find the mean, median, mode, and range of 2,8,3,8,4
1- Put all of the scores in order from least to greatest (* which you already do this to find the median)
2- What is the biggest #? What is the smallest #?
3- The range is the difference between the greatest # and least # in a set of data is the range.
Example:
2,3,4,8,8
Biggest # = Smallest # = 2
8 – 2 = 6
Range = 6 or 2 to 6

20. Find the mean, median, mode, and range of 2,8,3,8,4
Outlier-
A number which is far removed from the other numbers in a data set.
The data that is shown above (2,8,3,8,4) does not have an outlier because all of the numbers are relatively close together.
What would the outlier be in the following set of data? 14, 12, 22, 7, 40, 5, 13, 14

21. Outlier- Find the mean, median, mode, and range of 2,8,3,8,4
A number which is far removed from the other numbers in a data set.
What would the outlier be in the following set of data? 14, 12, 22, 7, 40, 5, 13, 14
If you said 40, then you are correct!
If we arranged these numbers on a number line or a line plot, 40 would be “out” on it’s own.

22. Textbook page 450 #11-22 Practice on your own:
**Students may use calculators on all problems for MMMRO 

23. Homework
Bowling averages worksheet

24. Objectives
SPI Calculate measures of central tendency to analyze data.
Checks Evaluate how different measures of central tendency describe data.
Checks Identify outliers and determine their effect on mean, median, mode and range.
Find the mean, median, mode, range, and outlier in a data set.

25. Textbook page 452 # 7=10

26. Yummy Central Tendency
You will be placed in a group. Each group will be stacking cookies to determine how many they can stack before the stack falls. The # that should be used is the last one BEFORE the stack falls. (Example: if you add your tenth cookie to the stack and it falls, then you would write down 9) You will do this “test” 7 times; writing down the results from each stack. After the 7th stack, your group will return to your desk and find the mean, median, mode, and range for your data. At the end of class, one member from each group will record the group’s data on chart paper. While waiting for your group to perform their test, all students should be working on WB pgs

27. Median, Mode, Range 18-08
If you need

28. Range step by step

29. Mean step by step
IF you need it