1. Focus Question: What is central tendency, and what are some common measures of it? What do the following terms mean? Mean Median Mode Range

2. Measures of central tendency: Different methods used to find the "middle" value or perhaps a typical value of the data. Today we are going to focus on

3. Copyright © 2000 by Monica Yuskaitis Vocabulary Review Sum – the answer to an addition problem. Addend – the numbers you added together to get the sum. 6 + 9 = 15

4. Copyright © 2000 by Monica Yuskaitis Definition Mean Means Average

5. Copyright © 2000 by Monica Yuskaitis Definition MeanMean – the average of a group of numbers. 2, 5, 2, 1, 5 Mean = 3

6. Copyright © 2000 by Monica Yuskaitis Mean is found by evening out the numbers 2, 5, 2, 1, 5

7. Copyright © 2000 by Monica Yuskaitis Mean is found by evening out the numbers 2, 5, 2, 1, 5

8. Copyright © 2000 by Monica Yuskaitis Mean is found by evening out the numbers 2, 5, 2, 1, 5 mean = 3

9. Copyright © 2000 by Monica Yuskaitis How to Find the Mean of a Group of Numbers Step 1 – Add all the numbers. 8, 10, 12, 18, 22, 26 8+10+12+18+22+26 = 96

10. Copyright © 2000 by Monica Yuskaitis 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 8+10+12+18+22+26 = 96 How many addends are there?

11. Copyright © 2000 by Monica Yuskaitis How to Find the Mean of a Group of Numbers Step 2 – Divide the sum by the number of addends. 6)6) 96 sum# of addends 1 6 36 6 63

12. Copyright © 2000 by Monica Yuskaitis How to Find the Mean of a Group of Numbers The mean or average of these numbers is 16. 8, 10, 12, 18, 22, 26

13. Copyright © 2000 by Monica Yuskaitis What is the mean of these numbers? 1, 2, 7, 11, 19 8

14. Copyright © 2000 by Monica Yuskaitis What is the mean of these numbers? 26, 33, 41, 52 38

15. Copyright © 2000 by Monica Yuskaitis Definition Mode is the most Popular

16. Copyright © 2000 by Monica Yuskaitis Definition A la modeA la mode – the most popular or that which is in fashion. Baseball caps are a la mode today.

17. Copyright © 2000 by Monica Yuskaitis Definition ModeMode – the number that appears most frequently in a set of numbers. 1, 3, 7, 10, 13 Mode = 1

18. Copyright © 2000 by Monica Yuskaitis How to Find the Mode in a Group of Numbers Step 1 – Arrange the numbers in order from least to greatest. 21, 18, 24, 19, 18 18, 19, 21, 24

19. Copyright © 2000 by Monica Yuskaitis How to Find the Mode in a Group of Numbers Step 2 – Find the number that is repeated the most. 21, 18, 24, 19, 18 18, 18, 19, 21, 24

20. Copyright © 2000 by Monica Yuskaitis Which number is the mode? 29, 8, 4,19, 8,19 8 & 19 Please note: There can be more than one mode 4, 8, 19,19, 29

21. Copyright © 2000 by Monica Yuskaitis Which number is the mode? 1, 2, 2, 9, 9, 4, 9, 10 9 1, 2, 4, 9, 10

22. Copyright © 2000 by Monica Yuskaitis Which number is the mode? 22, 21, 27, 31, 23, 32 There is no mode.. It is possible not to have a mode in a set of numbers 21, 22, 23, 27, 31, 32

23. Real life example: Dameon wants to know what his homework average is in math class. If he has the following scores what is his homework average? 95, 100, 100, 50, and 75 Copyright © 2000 by Monica Yuskaitis

24. Independent Practice: Worksheet Share Reflection: How can we use mean in the real world? Copyright © 2000 by Monica Yuskaitis