6-4 Bar Graphs

Learn to display and analyze data in bar graphs.

6-4 Bar Graphs

Vocabulary

bar graphdouble-bar graph

6-4 Bar Graphs

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

6-4 Bar Graphs

Additional Example 1A: Reading a Bar Graph

Use the bar graph to answer each question.

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

Find the lowest bar.

The coniferous forest has the least average summer temperature.

6-4 Bar Graphs

Additional Example 1B: Reading a Bar Graph

Use the bar graph to answer each question.Which biomes in the graph have an average summer temperature of 30C or greater?Find the bar or bars whose heights measure 30 or more than 30.

The grassland and the rain forest have average summer temperatures of 30C or greater.

6-4 Bar Graphs

Check It Out: Example 1A

Use the bar graph to answer each question.

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

Find the highest bar.

The rain forest has the highest average summer temperature.

6-4 Bar Graphs

Check It Out: Example 1B

Use the bar graph to answer each question.

Which biomes in the graph have an average summer temperature of 25C or greater?

Find the bar or bars whose heights measure 25 or more than 25.

The deciduous forest, the grassland, and the rain forest have average summer temperatures of 25C or greater.

6-4 Bar Graphs

Additional Example 2: Making a Bar Graph

Use the data to make a bar graph.

374597258

Grade 8Grade 7Grade 6

Magazine Subscriptions Sold

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.

6-4 Bar Graphs

Check It Out: Example 2

Use the data to make a bar graph.

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Grade 8Grade 7Grade 6

Tickets SoldStep 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.

Grade 6

Grade 7

Grade 8

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350Tickets Sold

Grade

Tic

kets

6-4 Bar Graphs

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

6-4 Bar Graphs

Additional Example 3: Problem Solving Application

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

4148Girls

16612Boys

ScienceMusicArtClub

Club Memberships

11 Understand the Problem

You are asked to use a graph to compare the data given in the table. You will need to use all of the information given.

6-4 Bar Graphs

22 Make a Plan

You can make a double-bar graph to display the two sets of data.

Additional Example 3 Continued

6-4 Bar Graphs

Additional Example 3 Continued

Solve33 Determine appropriate scales for both sets of data.

Use the data to determine the lengths of the bars. Draw bars of equal width. Bars should be in pairs. Use a different color for boy memberships and girl memberships. Title the graph and label both axes.

Include a key to show what each bar represents.

6-4 Bar Graphs

Additional Example 3 Continued

Look Back44

You could make two separate graphs, one of boy memberships and one of girl memberships. However, it is easier to compare the two data sets when they are on the same graph.

6-4 Bar Graphs

Check It Out: Example 3

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

15711Girls

16149Boys

Year BookChessBandClub

Club Memberships

11 Understand the Problem

You are asked to use a graph to compare the data given in the table. You will need to use all of the information given.

6-4 Bar Graphs

Check It Out: Example 3

22 Make a PlanYou can make a double-bar graph to display the two sets of data.

6-4 Bar Graphs

Check It Out: Example 3 Continued

Solve33 Determine appropriate scales for both sets of data.

Use the data to determine the lengths of the bars. Draw bars of equal width. Bars should be in pairs. Use a different color for boy memberships and girl memberships. Title the graph and label both axes.

Include a key to show what each bar represents.

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Chess Band Year Book

Boys

Girls

Club

Club Memberships

Mem

ber

ship

s

6-4 Bar Graphs

Check It Out: Example 3 Continued

Look Back44

You could make two separate graphs, one of boy memberships and one of girl memberships. However, it is easier to compare the two data sets when they are on the same graph.

6-4 Bar Graphs

Lesson Quiz: Part 1

Use the bar graph to answer each question.

1. Which animal was least popular among students?

2. Which pet was more popular to twice as many students as rabbits were? dog

bird

Student Pet Survey

6-4 Bar Graphs

Lesson Quiz: Part 2

3. Make a bar graph of this data.

Number of Daily Servings

Grains = 6

Fruit = 2

Meat = 2

Milk = 3

Vegetables = 3

Number of Daily Servings

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Grains

Fruit

Meat

Milk

Vegetables