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6-4 Bar Graphs6-4 Bar Graphs

Course 1

Warm UpWarm Up

Lesson PresentationLesson Presentation

Problem of the DayProblem of the Day

Course 1

6-4 Bar Graphs

Warm UpUse the following data set.45 55 58 63 63 37 76 46 34

1.What is the mean of the data?

2. What is the median of the data?

3. What is the mode of the data?

Add up all the numbers then divide

by how many numbers you have

Put the numbers in order from least to

greatest then find the number in the middle

Add up all the numbers then divide

by how many numbers you have

Course 1

6-4 Bar Graphs

Warm UpUse the following data set.45 55 58 63 63 37 76 46 34

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

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6-4 Bar Graphs

Vocabulary

bar graphdouble-bar graph

Course 1

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.

Course 1

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?

The coniferous forest has the least average summer temperature.

Course 1

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?

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

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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?

The rain forest has the highest average summer temperature.

Course 1

6-4 Bar Graphs

Additional Example 2: Making a Bar Graph

Use the given data to make a bar graph.

Magazine Subscriptions Sold

Grade 6 Grade 7 Grade 8

258 597 374

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.

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6-4 Bar Graphs

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

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6-4 Bar Graphs

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

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.

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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.

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6-4 Bar Graphs

Lesson Quiz: Part 1Use 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

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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

Course 1

6-4 Bar Graphs

Lesson Quiz: Part 1Use 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

Course 1

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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Da

ily

Se

rvin

gs

Grains

Fruit

Meat

Milk

Vegetables