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Stem and-leaf plots
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Stem and-leaf plots

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Transcript

  • 1. Stem-and-Leaf Plots Susan Phillips Lee’s Summit, MO
  • 2. 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
  • 3. Here are the scores for a freshman basketball team  Here is the same data organized into a stem-and-leaf plot.
  • 4. 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.
  • 5. The key shows us which place value the digits represent.
  • 6. The stems all represent tens place in this stem-and-leaf plot. The leaves all represent ones.
  • 7. Let’s try one together…
  • 8. Here are one student’s math test scores. Make a stem-and-leaf plot for this data. First, draw the dividing lines.
  • 9. Here are one student’s math test scores. Make a stem-and-leaf plot for this data. Stems Next, label the stem side and the leaf side. Leaves
  • 10. Here are one student’s math test scores. Make a stem-and-leaf plot for this data. Stems Leaves 7 5 Find the smallest piece of data and plot it on the grid.
  • 11. Here are one student’s math test scores. Make a stem-and-leaf plot for this data. Stems Leaves 7 5 9 Find the next smallest piece of data and plot it on the grid. The 7 for the tens place is already there. We just add the 9.
  • 12. Continue with this process until you have entered all the data. Stems Leaves 7 5 9 8 3 4 6 6 8 9 1 4 9
  • 13. Remember to add a title. Test Scores Stems Leaves 7 5 9 8 3 4 6 6 8 9 1 4 9
  • 14. Don’t forget the key! Test Scores Stems Leaves 7 5 9 8 3 4 6 6 8 9 1 4 9 Key: 7 5 means 75
  • 15. You just completed a stem-and-leaf plot!
  • 16. Now, try it on your own…
  • 17. 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.
  • 18. Use this data to make a stem-and-leaf plot. 2002 Winter Olympics 500-Meter Speed-Skating Times in Seconds
  • 19. Check your work… 2002 Winter Olympics 500-Meter Speed-Skating Times in Seconds
  • 20. Using Stem-and-Leaf Plots Boxes of Girl Scout Cookies Sold by Troop 220  What was the least number of cookies sold? 40 boxes
  • 21. Using Stem-and-Leaf Plots Boxes of Girl Scout Cookies Sold by Troop 220  What was the largest number of cookies sold? 94 boxes
  • 22. Using Stem-and-Leaf Plots Boxes of Girl Scout Cookies Sold by Troop 220  Find the median of the data Find the middle leaf… 63 boxes
  • 23. Using Stem-and-Leaf Plots Boxes of Girl Scout Cookies Sold by Troop 220  Find the mode of the data Look for the number that occurs most often in a row of leaves 63 boxes
  • 24. Stem-and-Leaf Plots The End