#30BAR GRAPHS AND

LINE GRAPHS

A bar graph can be used to display and compare data. A bar graph displays data with vertical or horizontal bars.

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Additional Example 1: Reading a Bar Graph

Use the bar graph to answer each question.

Which biome in the graph has the least average summer temperature?

Example 2: Reading a Bar Graph

Use the bar graph to answer each question.Which biomes in the graph have an average summer temperature of 30 C or greater?

Example 3: Making a Bar Graph

Use the given data to make a bar graph.

Step 1: Find an appropriate scale and interval. The scale must include all of the data values. The interval separates the scale into equal parts.

Step 2: Use the data to determine the lengths of the bars. Draw bars of equal width. The bars cannot touch.

Step 3: Title the graph and label the axes.

Example 4

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Grade 8Grade 7Grade 6

Tickets Sold

Use the data to make a bar graph.

A double-bar graph shows two sets of related data.

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Example 5: Problem Solving Application

Make a double-bar graph to compare the data in the table.

10148Girls

16612Boys

ScienceMusicArtClub

Club Memberships

Example 6

Make a double-bar graph to compare the data in the table.

15711Girls

16149Boys

Year BookChessBandClub

Club Memberships

Data that shows change over time is best displayed in a line graph. A line graph displays a set of data using line segments.

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Example 7: Making a Line Graph

Use the data in the table to make a line graph.

5,0001700

4,2001690

1,8001670

1,3001650

PopulationYear

Population of New Hampshire

Example 8: Reading a Line Graph

Use the line graph to answer each question.

A. In which year did CDs cost the most?

B. About how much did CDs cost in 2000?

C. Did CD prices increase or decrease from 1999 through 2002?

Example 9

Use the line graph to answer each question.

A. In which year did CDs cost the least?

B. About how much did CDs cost in 1999?

C. Did CD prices increase or decrease from 2001 to 2002?

Line graphs that display two sets of data are called double-line graphs.

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Example 10: Making a Double-Line Graph

Use the data in the table to make a double-line graph.

$21$31$35$38Corporation B

$33$34$20$16Corporation A

2000199519901985

Stock Prices

Use different colors of lines to connect the stock values so you will easily be able to tell the data apart.

Helpful Hint