Page 1 of 4
Bar Graphs
BEFORE
Now
WHY?
You organized and displayed
data using frequency tables.
You’ll display data using bar
graphs.
So you can visualize data, such as
the soccer records in Ex. 8.
In the Real World
Word Watch
bar graph, p. 79
double bar graph, p. 80
Zoo Animals Two hundred
sixth and seventh grade students
were asked to name their favorite
zoo animal. The results are shown
in the table. How can you
represent this data visually?
Favorite Zoo Animal
Zoo animal
lion
giraffe
monkey
elephant
other
A bar graph is a type of graph
in which the lengths of the
bars are used to represent
and compare data. A numerical scale is used
to determine the lengths of the bars.
EXAMPLE
You can display the data from the table above in a bar graph.
1 Choose a numerical scale.
Start the scale at 0. The greatest data value is 55, so end the scale at
a value greater than 55, such as 60. Use equal increments along the
scale, such as increments of 10.
2 Draw and label the graph.
Favorite Zoo Animal
60
50
40
30
20
10
0
Use the scale to
decide how long to
make the bar for
each data value.
Gi
raf
fe
Mo
nk
ey
Ele
ph
an
t
Ot
he
r
Need help with reading a
bar graph? See page 704.
Making a Bar Graph
1
Lio
n
Review
Students
with
Students
43
19
55
49
34
Lesson 2.5
Bar Graphs
79
Page 2 of 4
Double Bar Graphs A double bar graph is a bar graph
that shows two sets of data on the same graph. The two bars
for each category are drawn next to each other.
2
EXAMPLE
Making a Double Bar Graph
Zoo Animals Make a double bar
graph of the zoo animal data in the
table at the right.
Favorite
zoo animal
Seventh
grade
19
13
29
21
15
24
6
26
28
19
lion
giraffe
monkey
elephant
other
1 First draw one set of bars using
the sixth grade data, as shown
below. The greatest data value in
the table is 29, so end the scale
at 30.
30
20
10
0
Ot
he
r
ra
Gi
M
on
ke
y
Ele
ph
an
t
ffe
Leave room for the
seventh grade bars.
Lio
n
Students
Sixth
grade
2 Then draw the seventh grade bars next to the sixth grade bars and
shade them a different color. Add a title and a key.
Sixth grade
Your turn now
Make a key to show what
each color represents.
Favorite Sports
Sport
basketball
Watching
593
Participating
570
Chapter 2
Seventh grade
Make a double bar graph of the data.
1.
80
Ot
he
r
M
on
ke
y
Ele
ph
an
t
Gi
ra
ffe
30
20
10
0
Lio
n
Students
Favorite Zoo Animal
Measurement and Statistics
swimming
260
319
gymnastics
370
197
hockey
175
197
track
250
209
Page 3 of 4
INTERNET
Exercises
eWorkbook Plus
CLASSZONE.COM
More Practice, p. 709
Getting Ready to Practice
1. Vocabulary Explain how to choose a scale for a bar graph.
A survey asked the question, “What is
the most important thing kids can do
to protect the environment?” The
results are shown in the table.
2. Choose a scale for a bar
graph of the data.
3. Draw and label the bar graph.
4. “Recycle” had about 4 times the
Activity
Responses
Recycle
Buy environmentally
friendly products
Write your elected
representatives
Raise money
Plant trees
834
358
221
401
480
number of responses as which
other activity?
Practice and Problem Solving
Make a bar graph of the data.
5.
Mountain Ranges
of the World
Range
Kunlun
St. Elias
Tien Shan
Andes
6.
Peaks (over 6000 m)
228
1
40
84
Maximum Life Span of
Animals in Captivity
Animal
lion
giraffe
monkey
Asian elephant
Life Span (years)
30
36
37
77
Make a double bar graph of the data.
7.
with
Homework
Example Exercises
1
5, 6
2
7, 8
Online Resources
Cost of Food
(cents per pound)
Food
apples
chicken
ice cream
eggs
spaghetti
1990
77
86
254
100
85
2000
82
108
366
96
88
8.
Major Indoor Soccer League
National Conference 2000–2001
Team
Kansas City
Toronto
Detroit
Milwaukee
Wichita
Wins
14
21
13
24
18
Losses
26
19
27
16
21
CLASSZONE.COM
• More Examples
• eTutorial Plus
9. Use your graph from Exercise 7 to decide which of the foods had the
greatest price increase from 1990 to 2000.
Lesson 2.5
Bar Graphs
81
Page 4 of 4
10. Movie Ticket Prices Describe
13. Challenge Draw the stacked
Sometimes
bar graph as a double bar
graph.
Wo
rk
are the advantages and
disadvantages of a stacked bar
graph?
250
200
150
100
50
0
frie Vis
nd it
s
Sh
err op
an /
ds
12. Compare and Contrast What
Skating as Transportation
People
In-line Skating The stacked bar
graph shows the results of a
survey about how people use
in-line skates.
Jap
an
Fra
nc
e
B
Sw raz
itz il
erl
an
d
So US
uth A
Af
ric
a
a bar graph affect how the bar
graph is interpreted?
20
15
10
5
0
Sc
ho
ol
11. Writing How might the scale of
Movie Ticket Prices
Price (dollars)
how the appearance of the graph
will change if the scale goes from
0 to 40 in increments of 10 or
from 0 to 200 in increments of 50.
Often
Mixed Review
Solve the equation using mental math. (Lesson 1.6)
14. x 2 15
15. 10 x 6
16. 3x 24
17. 72 x 9
18. Make a frequency table and a line plot of the following scores for a
10 point quiz: 9, 10, 6, 7, 7, 8, 9, 8, 9, 6, 7, 9, 8, 7, 7, 9. (Lesson 2.4)
Basic Skills Tell how much change you should receive if you
pay for an item of the given price with a $10 bill.
19. $5.25
20. $3.75
21. $7.75
22. $6.50
Test-Taking Practice
INTERNET
State Test Practice
23. Multiple Choice Choose the best increment for the numerical scale of
a bar graph showing the data values 53, 31, 25, 13, and 46.
CLASSZONE.COM
A. 1
B. 10
C. 50
D. 100
24. Short Response Explain how to make a double bar graph of favorite
school subjects from a graph showing favorites for sixth graders and a
graph showing favorites for seventh graders.
82
Chapter 2
Measurement and Statistics