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:
1, 6, 10, 4, 2, 8, 15, 6, 3
Step #1: Put the numbers in order from least to greatest:
1, 2, 3, 4, 6, 6, 8, 10, 15
Step #2: Create a number line…that extends beyond the minimum and maximum.
Step #3: Find the Median…draw a line above the median on the number line.
Step #4: Find the Upper Quartile…draw a line above the upper quartile.
Step #5: Find the Lower Quartile…draw a line above the lower quartile.
Step #6: Create a box (a rectangle) above the number line with the upper and lower quartiles as two of the sides.
Step #7: Create whiskers (straight lines) that extend from the box to the minimum and maximum.

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 (4.5)
Discussion Question:
Why are all of the Boxes and Whiskers different sizes?

5. Analyzing a Box-and-Whisker Plot
_____%
25%
25%
25%
25%
50%
50%

6. 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

7. Evaluation Questions

8. 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

9. 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

11. 1. 2. 3. 4. 5.