1. Box-and-Whisker Plots
We are learning to…create and analyze Box-and-Whisker plots.

2. Box-and-Whisker Plot Vocabulary
Median – The middle number of a set of data.
Upper Quartile – The median of the data values that are greater than the median of the total data set.
Lower Quartile – The median of the data values that are less than the median of the total data set.
Maximum– The highest number in a set of data
Minimum- The lowest number in a set of data
Range- the difference between the minimum and maximum.
Inter-Quartile Range – the difference between the upper and lower quartile of a set of data

3. Box-and-Whisker Plot Practice
Make a box-and-whisker plot using the following set of data:
19, 18, 9, 4, 15
Step #1: Put the numbers in order from least to greatest:
4, 9, 15, 18, 19
Step #2: Find the median of your data.
Step #3: Draw a number line.
Step #4: Draw 2 dots- 1 dot above the minimum value of your data and 1 dot above the maximum value of your data.
Step #5: Draw a vertical line at the median.
Step #6: Find the median of the first half of the data and draw a vertical line.
Step #7: Find the median of the second half of the data and draw a vertical line.
Step # 8 Draw two horizontal lines to complete your box

4. Box-and-Whisker Plot Practice
There are 12 people are in a Habanera Pepper eating contest who ate the following amount of peppers:
4, 4, 4, 9, 15, 2, 5, 0, 10, 12, 1, 18
Put the numbers in order from least to greatest:
0, 1, 2, 4, 4, 4, 5, 9, 10, 12, 15, 18
BELOW THE MEDIAN (4.5)
ABOVE THE MEDIAN (13.5)
Discussion Question:
Why are all of the Boxes and Whiskers different sizes?

5. How to find the: Inter-Quartile Range
Inter-Quartile Range – the difference between the upper and lower quartile of a set of data.
Inter-Quartile Range = Upper Quartile – Lower Quartile
Show where you could find the inter-quartile range on the
box-and-whisker plot below:
INTER-QUARTILE RANGE

6. Evaluation Questions

7. Colby graphed some data as shown in this box-and-whisker plot.
Which statement is true about Colby’s data?
The range of the data is 25.
One-half of the data is below 65.
The median of the data is 60.
Three-fourths of the data is below 90. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

8. The inter-quartile range is 8 The upper quartile is -2.
Which of the following is not true about the box-and-whisker plot shown below?
The inter-quartile range is 8
The upper quartile is -2.
The median of the data is 1.
The lower extreme is -9. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

10. 1. 2. 3. 4. 5.