1. 6-4
Bar Graphs
Course 1
Warm Up
Problem of the Day
Lesson Presentation

2. Warm Up
Use the following data set.
1. What is the mean of the data?
2. What is the median of the data?
3. What is the mode of the data? 53 55 63

3. Problem of the Day
The distance around the bases is 4  90 feet. How many runs does a baseball team need to score before the scoring base runners have covered a mile? (1 mile = 5,280 feet)
15 runs

4. Learn to display and analyze data in bar graphs.

5. Vocabulary
bar graph
double-bar graph

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

7. 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.

8. 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 30C 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 30C or greater.

9. 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.

10. Check It Out: Example 1B
Use the bar graph to answer each question.
Which biomes in the graph have an average summer temperature of 25C 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 25C or greater.

11. Magazine Subscriptions Sold
Additional Example 2: 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.
Magazine Subscriptions Sold
Grade 6
Grade 7
Grade 8
258
597
374
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.

12. Use the given data to make a bar graph.
Check It Out: Example 2
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.
Tickets Sold
Grade 6
Grade 7
Grade 8
310
215
285
Grade 6
Grade 7
Grade 8
Tickets Sold
Grade
Tickets
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.

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

14. Understand the Problem
Additional Example 3: Problem Solving Application
Make a double-bar graph to compare the data in the table.
Club Memberships
Club
Art
Music
Science
Boys 12 6 16
Girls 8 14 4 1
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.

15. Additional Example 3 Continued2
Make a Plan
You can make a double-bar graph to display the two sets of data.

16. Additional Example 3 Continued
Solve 3
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.

17. Additional Example 3 Continued4
Look Back
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.

18. Understand the Problem
Check It Out: Example 3
Make a double-bar graph to compare the data in the table.
Club Memberships
Club
Band
Chess
Year Book
Boys 9 14 16
Girls 11 7 15 1
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.

19. Check It Out: Example 3 2
Make a Plan
You can make a double-bar graph to display the two sets of data.

20. Check It Out: Example 3 Continued
Solve 3
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.
Club Memberships
Memberships
Club

21. Check It Out: Example 3 Continued4
Look Back
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.

22. Use the bar graph to answer each question.
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?
Student Pet Survey
bird
dog

23. 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