2. Statistics: The branch of mathematics that deals with collecting, organizing, and analyzing or interpreting data. Data: Numerical facts or numerical information. Mean: average of all #’s (add up and divide) Median: the middle number. Mode: the number that appears the most. Range: the difference between the largest and smallest number.

3. 8 4 Stem Leaf Leaf: The last digit on the right of the number. Stem: The digit or digits that remain when the leaf is dropped. = 84

4. Here are the scores from two periods of math class. Students took the same test. Period 1: 77 79 85 58 97 94 82 81 75 63 60 92 75 98 83 58 72 57 70 81 Period 2: 57 60 88 85 79 70 65 98 97 59 58 65 62 77 77 75 73 69 82 81

5. Period 1: 85 58 94 81 75 63 60 92 75 83 57 72 57 70 81 * Step 1: Write the data in order from least to greatest. 57, 57, 58, 60, 63, 70, 72, 75, 75, 81, 81, 83, 85, 92, 94

6. Step 2: Divide the numbers into groups by their tens digit. 57, 57, 58, 60, 63, 70, 72, 75, 75, 81, 81, 83, 85, 92, 94

7. Step 3: Locate all of your stems (the number or numbers furthest to the left). *Write them under the stem section of your stem and leaf plot. 57, 57, 58, 60, 63, 70, 72, 75, 75, 81, 81, 83, 85, 92, 94 STEMLEAF 5 6 7 8 9 Creating a Stem-and-Leaf Plot

8. Step 4: Locate all of your leaves (the number furthest to the right). *Write them under the leaf section of your stem and leaf plot. 57, 57, 58, 60, 63, 70, 72, 75, 75, 81, 81, 83, 85, 92, 94 STEMLEAF 5 6 7 8 9 7 7 8 0 3 0 2 5 5 1 1 3 5 2 4 Creating a Stem-and-Leaf Plot

9. Step 5: Add a key! STEMLEAF 5 6 7 8 9 7 7 8 0 3 0 2 5 5 1 1 3 5 2 4 Key: 7 5 means 75 Creating a Stem-and-Leaf Plot

10. Period 2: 99 55 95 55 92 59 60 67 63 67 88 72 87 75 79 *Step 1: Write the data in order from least to greatest. 55, 55, 59, 60, 63, 67, 67, 72, 75, 79, 87, 88, 92, 95, 99 Let’s Try Again Creating a Stem-and-Leaf Plot

11. Step 2: Divide the numbers into groups by their tens digit. 55, 55, 59, 60, 63, 67, 67, 72, 75, 79, 87, 88, 92, 95, 99

12. Step 3: Locate all of your stems (the number or numbers furthest to the left). *Write them under the stem section of your stem and leaf plot. 55, 55, 59, 60, 63, 67, 67, 72, 75, 79, 87, 88, 92, 95, 99 STEMLEAF Creating a Stem-and-Leaf Plot

13. Step 4: Locate all of your leaves (the number furthest to the right). *Write them under the leaf section of your stem and leaf plot. 55, 55, 59, 60, 63, 67, 67, 72, 75, 79, 87, 88, 92, 95, 99 STEMLEAF 5 6 7 8 Creating a Stem-and-Leaf Plot 9

14. Step 5: Add a key!! Key: 6 0 means 60 STEMLEAF 5 6 7 8 5 5 9 0 3 7 7 2 5 9 7 8 9 2 5 9

15. Comparing Two Sets of Data with a Stem-and-Leaf Plot STEMLEAF 5 6 7 8 5 5 9 0 3 7 7 2 5 9 7 8 92 5 9 8 7 7 5 5 2 0 5 3 1 1 4 2 LEAF 3 0 Period 1Period 2 Key: 7 5 5 means 57  55 Key: 7 5 5 means 57  55

16. Comparing Two Sets of Data with a Stem-and-Leaf Plot

17. Double Stem-and-Leaf Plot

18. Reading a Stem-and-Leaf Plot What is the mean? What is the range?

19. Reading a Stem-and-Leaf Plot What is the median? What is the mode?

20. Reading a Stem-and-Leaf Plot

22. On the paper you have, find the mean, median mode and range of the following data represented in the stem-and-leaf plot.