1. Box-and-Whisker Plots
Notes 1-8
Box-and-Whisker Plots

2. Lower Quartile The median of the lower half of data
6, 6, 8, 4, 7, 0, 3, 4, 6, 2, 1

3. Upper quartile The median of the upper half of data
6, 6, 8, 4, 7, 0, 3, 4, 6, 2, 1

4. Drawing a box-and-whisker plot
Step 1: Order the data from least to greatest
Step 2: Find the minimum and maximum values, the median, and the lower and upper quartiles
Step 3: Plot the numbers on a number line
Step 4: Draw the box, the whiskers, and a line segment through the median

5. Practice
Use the data sets to create two box-and-whisker plots. Set 1: 6, 6, 8, 4, 7, 0, 3, 4, 6, 2, 1 Set 2: 3, 4, 8, 2, 4, 6, 6, 9, 4, 2, 3
What is the greatest and least values of Set 1?
What is the range of Set 1?
Which set has the greatest median?
What is the range of the lower 50% of Set 2?
What is the range of the middle 50% of Set 2?

6. Homework: P 572 1-4 (E. P. 1-7) and 1-5 (E.P. 1-8)
WS Extra Practice 1-8