Course 2 7-4 Reading and Interpreting Circle Graphs 7-4 Reading and Interpreting Circle Graphs...

Course 2

7-4Reading and Interpreting Circle Graphs7-4 Reading and Interpreting

Circle Graphs

Course 2

Warm UpWarm Up

Problem of the DayProblem of the Day

Lesson PresentationLesson Presentation

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7-4Reading and Interpreting Circle Graphs

Warm UpWrite each fraction as a percent.

1. 2. 3.

Write each percent as a fraction.

4. 20% 5. 25% 6. 60%

75% 10% 40%34

110

25

15

14

35

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Problem of the Day

Riddle: When does 1 + 1 + 1 = 1?1 ft + 1 ft + 1 ft = 1 yd

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Learn to read and interpret data presented in circle graphs.

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Vocabulary

circle graphsector

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A circle graph, also called a pie chart, shows how a set of data is divided into parts.

The entire circle contains 100% of the data.

Each sector, or slice, of the circle represents one part of the entire data set.

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The circle graph compares the number of species in each group of echinoderms. Echinoderms are marine animals that live on the ocean floor. The name echinoderm means “spiny-skinned.”

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Use the circle graph to answer the question.

Additional Example 1A: Life Science Application

Which group of echinoderms includes the fewest number of species?

The sector for sea lilies and feather stars is the smallest, so this group includes the fewest number of species.

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Additional Example 1B: Life Science Application

Approximately what percent of echinoderm species are brittle stars and basket stars?

about , so approximately 33%

13

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Additional Example 1C: Life Science Application

Which group is made up of a greater number of species, sea cucumbers or sea stars?

The sector for sea stars is larger than the sector for sea cucumbers. This means there are more kinds of sea stars than sea cucumbers.

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Use the circle graph to answer each question.

Check It Out: Example 1A

Which size car sold the most?

Midsize

Small

LuxuryLarge

The sector for midsize cars is larger than any other of the sectors of car sizes. This means midsize cars were sold the most.

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Check It Out: Example 1B

Approximately what percent of cars sold were midsize?

Midsize

Small

LuxuryLarge

The midsize sector is approximately half or about 50%.

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Check It Out: Example 1C

Which size sold less—large or small?

Midsize

Small

LuxuryLarge

The smallest sector between Large and Small is Large. Large sized cars sold less.

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Leon surveyed 30 people about pet ownership. The circle graph shows his results. Use the graph to answer each question.

Additional Example 2A: Interpreting Circle Graphs

How many people own dogs only?

The circle graph shows that 20% of the 30 people own dogs only.

20% of 30 = 0.2 • 30

= 66 people own dogs only.

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Leon surveyed 30 people about whether they own pets. The circle graph shows his results. Use the graph to answer each question.

Additional Example 2B: Interpreting Circle Graphs

How many people own both cats and dogs?

Since 20% is 6 people, 10% is 3 people.

3 people own both cats and dogs.

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Fifty students were asked which instrument they could play. The circle graph shows the responses. Use the graph to answer each question.

How many students do not play an instrument?

piano20%

no instrument50%

flute10%

drum20%

The circle graph shows that 50% of 50 students do not play an instrument.

50% of 50 = 0.5 • 50

= 25

25 students do not play an instrument.

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Fifty students were asked which instrument they could play. The circle graph shows the responses. Use the graph to answer each question.

Ten students said they play the piano. How many play the flute?

Since 20% is 10 students, 10% is 5 students.

Five students play the flute.

piano20%

no instrument50%

flute10%

drum20%

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Decide whether a bar graph or circle graph would best display the information. Explain your answer.

Additional Example 3A: Choosing an Appropriate Graph

the percent of U.S. population living in the different states

A circle graph is the better choice because it shows how parts of a whole are divided.

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Decide whether a bar graph or circle graph would best display the information. Explain your answers.

Additional Example 3B: Choosing an Appropriate Graph

the number of tickets sold for each night of a school play

A bar graph is the better choice because it makes it easy to see how the number of tickets sold changed over each night.

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Additional Example 3C: Choosing an Appropriate Graph

the comparison between the number of students in a math class and the total student population.

A circle graph is the better choice because it shows what part of the students are in a math class.

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7-4 Reading and Interpreting Circle Graphs

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the percent of people buying a certain color of a new vehicle

A circle graph is the better choice because it makes it easier to see what part (or percent) of people is buying a certain color of vehicle.

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the comparison of different themes voted on for a school party

A circle graph is a better choice because the sectors that represent the themes could be easily compared.

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Check It Out: Example 3C

the number of visitors to the Grand Canyon for the last ten years

A bar graph is the better choice because it makes it easy to see how the number of visitors has changed over the years.

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Lesson Quiz: Part IUse the circle graph to answer questions 1-4.

1. Which group of CDs sold the most?

2. What percent of the CD sales are country?

3. Which type of CD sells the least?

4. If a total of 500 CD’s are sold, how many are Jazz?

rock

27%

rap

55

41%

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Lesson Quiz: Part II

5. Would a bar or circle graph best display the sales of a department store for the last 5 months?

bar graph

Course 2 7-4 Reading and Interpreting Circle Graphs 7-4 Reading and Interpreting Circle Graphs...

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