Box-and-Whisker Plots

1
Box-and-Whisker Plots
COURSE 3 LESSON 10-4
Make a box-and-whisker plot for this data on
study hours per week 10, 13, 16, 17, 20, 22, 23,
24, 26, 30, 31.
Step 1 The data is in order from least to
greatest. Find the median.
10 13 16 17 20 22 23 24 26 30 31 The median is
the sixth number, 22.
Step 2 Find the lower quartile and the upper
quartile. They are the medians of the lower and
upper halves.
10 13 16 17 20 22 23 24 26 30 31 The lower
quartile is 16, and the upper quartile is 26.
10-4
2
Box-and-Whisker Plots
COURSE 3 LESSON 10-4
(continued)
10-4
3
Box-and-Whisker Plots
COURSE 3 LESSON 10-4
Write a paragraph to compare the data shown in
these plots.
The median attendance for football, around 1,750,
is over four times the median for soccer, 400.
The range for soccer is 2,600, which is larger
than the range for football.
Attendance for football is more tightly grouped
around the median than for soccer.
10-4
4
Box-and-Whisker Plots
COURSE 3 LESSON 10-4
1. Describe the following box-and-whisker
plot. 2. Make box-and-whisker plots on a
single number line to compare the individual
points scored by boys and girls. Girls 14, 15,
18, 20, 21, 21, 24, 24, 25, 27, 29 Boys 8, 8,
9, 10, 14, 18, 25, 25, 28, 28, 30
lower quartile is 8, upper quartile is 14,
median is 10, whiskers extend to 6 and 18
10-4