2. Drawing Box & Whisker Graphs

3. Step #1 Place your data in order. 32 45 38 43 42 38 27 40 41 40 39 27 32 38 38 39 40 40 41 42 43 45

4. Step #2 Find the median. (middle) 27 32 38 38 39 40 40 41 42 43 45

5. Step #3 Find the upper quartile. (the middle of the upper data half) 27 32 38 38 39 40 40 41 42 43 45

6. Step #4 Find the lower quartile. (the middle of the lower data half)

7. Step #5 Draw a number line which includes all data pieces. Make sure that you evenly space and number the line. 27 32 38 38 39 40 40 41 42 43 45 20253035404550 Notice how the data and the number line don’t match up.

8. Step #6 Draw the box using the upper and lower quartiles. 27 32 38 38 39 40 40 41 42 43 45 20253035404550

9. Step #7 Draw the whiskers using the highest (upper extreme) and lowest (lower extreme) piece of data. 27 32 38 38 39 40 40 41 42 43 45 20253035404550

10. Step #8 Draw the median. 27 32 38 38 39 40 40 41 42 43 45 20253035404550 Make sure that you line up each part of the graph on the number line.

11. Step #9 Title and label the graph. 20253035404550 Mrs. McDowell’s Bowling Scores Pins per Game

12. Now, how well can you read and interpret the box and whisker graph?

13. What was Mrs. McDowell’s highest bowling score? 20253035404550 Mrs. McDowell’s Bowling Scores Pins per Game 45

14. What was Mrs. McDowell’s lowest bowling score? 20253035404550 Mrs. McDowell’s Bowling Scores Pins per Game 27

15. Mrs. McDowell’s bowling scores are typically between what two scores? 20253035404550 Mrs. McDowell’s Bowling Scores Pins per Game 38 & 42