2. Stem-and-Leaf Plots Susan Phillips Lee’s Summit, MO

3. Stem-and-Leaf Plot  Uses place value to organize data  Shows data in an organized way so it can be analyzed easily  Organizes data so it is easier to find the median, mode, and range

4. Here are the scores for a freshman basketball team  Here is the same data organized into a stem-and-leaf plot.

5. Can you tell how the stem-and-leaf plot was made? The first number in the data is 27. Here is the 2 in the tens place. Here is the 7 in the ones place.

6. The key shows us which place value the digits represent.

7. The stems all represent tens place in this stem-and-leaf plot. The leaves all represent ones.

8. Let’s try one together…

9. Here are one student’s math test scores. Make a stem-and-leaf plot for this data. First, draw the dividing lines.

10. Here are one student’s math test scores. Make a stem-and-leaf plot for this data. Next, label the stem side and the leaf side. Stems Leaves

11. Here are one student’s math test scores. Make a stem-and-leaf plot for this data. Find the smallest piece of data and plot it on the grid. Stems Leaves 7 5

12. Here are one student’s math test scores. Make a stem-and-leaf plot for this data. Find the next smallest piece of data and plot it on the grid. Stems Leaves 7 59 The 7 for the tens place is already there. We just add the 9.

13. Continue with this process until you have entered all the data. Stems Leaves 7 59 8 34 6 6 8 9 1 4 9

14. Remember to add a title. Stems Leaves 7 59 8 34 6 6 8 9 1 4 9 Test Scores

15. Don’t forget the key! Stems Leaves 7 59 8 34 6 6 8 9 1 4 9 Test Scores Key: 7 5 means 75

16. You just completed a stem-and-leaf plot!

17. Now, try it on your own…

18. This table shows the times in seconds and hundredths of seconds for the women’s 500-meter speed-skating competition in the 2002 Winter Olympics.

19. Use this data to make a stem-and-leaf plot. 2002 Winter Olympics 500-Meter Speed-Skating Times in Seconds

20. Check your work… 2002 Winter Olympics 500-Meter Speed-Skating Times in Seconds

21. Using Stem-and-Leaf Plots  What was the least number of cookies sold? Boxes of Girl Scout Cookies Sold by Troop 220 40 boxes

22. Using Stem-and-Leaf Plots  What was the largest number of cookies sold? Boxes of Girl Scout Cookies Sold by Troop 220 94 boxes

23. Using Stem-and-Leaf Plots  Find the median of the data Find the middle leaf… 63 boxes Boxes of Girl Scout Cookies Sold by Troop 220

24. Using Stem-and-Leaf Plots  Find the mode of the data Look for the number that occurs most often in a row of leaves 63 boxes Boxes of Girl Scout Cookies Sold by Troop 220

25. Stem-and-Leaf Plots The End