1. Ms. Drake 7th grade Math Measures of Central Tendency Lesson 4 Frequency Tables and Stem and Leaf Plots

2. Week by Week Essentials http://mathlearnnc.sharpschool.c om/cms/One.aspx?portalId=4507 283&pageId=5149151 Go to: Resources for Mathematics: Grade 7 (2003 SCS) Week by Week Essentials

3. Measures of Central Tendency Vocabulary Bar graph Box- and-Whisker Plot Circle Graph Cumulative Frequency Double Bar Graph First Quartile Frequency Table

4. Measures of Central Tendency Vocabulary Histogram Line Graph Lower Extreme Mean Median Mode Negative Correlation No correlation

5. Measures of Central Tendency Vocabulary Outlier Population Positive correlation Random Sample Range Sample

6. Measures of Central Tendency Vocabulary Scatter Plot Second Quartile Sector Stem-and-Leaf Plot Third Quartile Upper Extreme

7. Frequency Tables A table that lists items together according to the number of times, or frequency, that the items occur.

8. Frequency Table A frequency table is a way to organize data into categories, groups or intervals. By including a cumulative frequency column in your table you can keep a running total of the frequencies in each interval.

9. Reading A Frequency Table How many chickens owned per family FrequencyCumulative Frequency 0-5///3 6-11//////9 12-17////13 18-23//15

10. How to Make a Frequency Table Collect Data Average Rainfall per Month in Malaysia in millimeters: 158, 201, 259, 292, 224,130,99,163, 218, 249, 259, 191 First determine the intervals, that is, how are you going to break up or group the data?

11. 158, 201, 259, 292, 224,130,99,163, 218, 249, 259, 191 The range is between 99 to 292 Intervals must be even.

12. So intervals of 99? 0-99 100-199 200-299

13. Put data in the right interval 158, 201, 259, 292, 224,130,99,163, 218, 249, 259, 191 Amount of Rainfall FrequencyCumulative Frequency 0-99 100-199 200-299

14. Amount of Rainfall FrequencyCumulative Frequency 0-99/ 1 100-199//// 5 200-299//// // 12 Does not give you exact data info

15. Let’s try this website together. http://www.ixl.com/mat h/practice/grade-7- create-frequency-charts

16. A Stem and Leaf Plot can be used to show how often data values occur and how they are distributed.

17. Minutes Doing Homework StemsLeaves 21 2 6 9 32 2 5 6 8 43 5 5 5 7 8 5 64 The stems are the tens digits There are no data values in the 50’s The leaves are the ones digits The entries in the second row represent the data values 32,32,35,36,38

18. Venezuela 21 Columbia 35 Ecuador 23 Peru 24 Bolivia 11 Chile 5 Argentina 20 Uruguay 6 Paraguay 13 Brazil 64 French Guiana 6 Suriname 5 Guyana 6 Numbers of Endangered Species

19. 21, 35, 23, 24, 11, 5, 20, 6, 13, 64, 6, 5, 6

20. EndangeredSpecies 5 5 6 6 6 11 3 20 1 3 4 35 4 5 64

21. Stem Plots Here is a great website to help you practice how to read and interpret stem and leaf plots. http://www.shodor.org/interac tivate/activities/StemAndLeafP lotter/

22. Try this on your own. http://www.glencoe.co m/sec/math/studytools/ cgi- bin/msgQuiz.php4?isbn= 0-02-833050- 1&chapter=2&lesson=1