Chapter 11 â Data and Statistics. Answer Key. CK-12 Middle School Math Concepts - Grade 7. 1. 11.1 Mean. Answers. 1. 5. 2. 7.2. 3. 15.22. 4. 22.38. ...

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Chapter 11 – Data and Statistics 11.1

Mean

Answers 1. 5

2. 7.2

3. 15.22

4. 22.38

5. 30

6. 36.57

7. 41.17

8. 126.56

9. 222.67

10. 545.17

11. 780.86

12. 348.67

13. 220.43

14. 1140.5

15. 2393.17

11.2

Median

Answers 1. 3

2. 13

3. 21

4. 18.5

5. 54

6. 3

7. 5

8. 12

9. 22.5

10. 30

11. 37

12. 43.5

13. 128

14. 223

15. 545.5

11.3

Mode

Answers 1. 7

2. 6

3. No mode

4. 121

5. 600

6. 4

7. 7

8. 11

9. 21

10. 33

11. 34

12. 43

13. 110

14. No mode

15. 550

11.4

Range of Spread/Dispersion

Answers 1. 34.71

2. 35

3. 40

4. 17

5. 157.2

6. 152.5

7. 200

8. 105

9. 25.6

10. 25

11. 25

12. 7

13. 8.9

14. 9 days

15. 9 days

16. 1 day

CK-12 Middle School Math Concepts - Grade 7

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Answer Key

Chapter 11 – Data and Statistics 11.5

Bar Graphs

Answers 1. 5

2. 20

3. Carrots

4. Tomatoes or potatoes

5. 30

6. 10

7. 15

8. 35, it would be the most

9. 60,20,50,30,20

10. 15, 5, 12.5, 7.5, 5

11. 90

12. 5

13. 0 – 35

14. units of 5

15. 20

11.6

Multiple Bar Graphs

Answers 1. 13

2. 28

3. 4

4. Florida and Pennsylvania

5. NY

6. Answers vary

7. Television

8. Television or DVD player

9. Television

10. Video Camera

11. Game system

12. Video camera

13. 7

14. 3

15. True

11.7

Line Graphs

Answers 1. 100

2. 300

3. 200 vegetables

4. 300

5. 0, no charge

6. 400 vegetables

7. 300 vegetables

8. 700 vegetables

9. 350 vegetables

10. 500 vegetables

11. 200 vegetables

12. False

13. True

14 – 15 Answer Vary

11.8

Multiple Line Graphs

Answers 1. Answers vary

2. Seattle

3. Seattle

4. 2007

5. 2007

6. Seattle zoo

7. increase

8. Increase

9. 30,300 tickets

10. 34,700

11. Line graph

12. Answers vary

13. False

14. Multiple line graph

15. Answers vary

CK-12 Middle School Math Concepts - Grade 7

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Chapter 11 – Data and Statistics 11.9

Answer Key

Stem-and-Leaf Plots

Answers 1.

2.

3.

2

2 5 7 9

3

1 4 4 9

4

0 4

6

5

7

2

8

6 8 9

9

0 1 6

10

0 1

0

4 6 6 7 8 9

1

1 2 5

2

0

2

1 5 6 7 9 9

3

1 4 6 8 9

4

0

4. 9.8 5. 7.5 6. 6 7. 16 8.

9. 31.25 10. 30

CK-12 Middle School Math Concepts - Grade 7

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Chapter 11 – Data and Statistics

Answer Key

11. 29 12. 19 13. 1, 2, 3 14. 7th 15. 16 = 8th, 11 = 7th 16. 8th 17. 4, 5, 6 18. 49° 19. 40° 20. Seattle 21. 18 22. 16 23. 56° = Austin, 40° = Seattle

CK-12 Middle School Math Concepts - Grade 7

4

Answer Key

Chapter 11 – Data and Statistics 11.10

Box – and – Whisker Plots

Answers 1. 22

2. 15

3. 28

4. 12

5. 31

6. 26

27

29

30

32

35

100

105

107

109

110

120

41

42

44

7. 32 8. 28 9. 41.5 10. 26 11. 44 12.

13. 108

14. 105

15. 110

16. 100

CK-12 Middle School Math Concepts - Grade 7

17. 120

5

Chapter 11 – Data and Statistics 11.11

Answer Key

Frequency Tables to Organize and Display Data

Answers 1. 174 4.

2. 5 days Days

Frequency

0

15

1

13

2

30

3

21

4

35

5

60

3. 1 day

5. 1 student 6. 175 total 7.

Books

Students

1

2

2

1

3

2

4 5

2

6

1

7

1

8

1

8. 4 9. 1, 3 or 5 10. Correct 11. Unorganized

CK-12 Middle School Math Concepts - Grade 7

6

Chapter 11 – Data and Statistics

Answer Key

12. 7 13. 4 14. 7 15. False 16. False

CK-12 Middle School Math Concepts - Grade 7

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Chapter 11 – Data and Statistics 11.12

Answer Key

Histograms

Answers 1. 4.5

4

3.5

3

2.5 Series 1 Series 2

2

Series 3

1.5

1

0.5

0

CK-12 Middle School Math Concepts - Grade 7

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Chapter 11 – Data and Statistics

Answer Key

2. Number

Frequency

2

1

3

1

4

1

5

4

6

1

7

3

8

2

9

2

10

1

11

1

12

1

13

0

14

1

15

1

CK-12 Middle School Math Concepts - Grade 7

9

Answer Key

Chapter 11 – Data and Statistics 3. 4.5 4 3.5 3 2.5

Series 1 Column1

2

Column2 1.5 1 0.5 0 2

3

4

5

6

7

8

9

10

11

12

13

14

15

4. Number

Frequency

3

3

4

1

5

1

7

1

8

1

9

2

10

1

11

1

12

1

CK-12 Middle School Math Concepts - Grade 7

10

Answer Key

Chapter 11 – Data and Statistics 5. 3.5 3 2.5 2

Series 1 Series 2

1.5

Series 3

1 0.5 0 3

4

5

6

7

8

9

10

11

12

6. The number three is the most popular and the number 6 is not even represented in the data. 7 – 10. Answers Vary 11. Number

Frequency

1

5

2

2

3

5

4

1

5

1

6

1

12. 1 and 3 13. 4, 5, 6 14. 5 15. 2, 5

CK-12 Middle School Math Concepts - Grade 7

11

Answer Key

Chapter 11 – Data and Statistics 11.13

Identification of Misleading Statistics

Answers 1. yes

2. Intervals aren’t consistent

3. Even out the intervals by using the same measures

4. 4

3.5

3

Time

2.5

2

1.5

1

0.5

0 6th

7th

8th

9th

10th

11th

12th

Grade

CK-12 Middle School Math Concepts - Grade 7

12

Answer Key

Chapter 11 – Data and Statistics 5. ONE POSSIBLE ANSWER 15

13

11

Time

9

7

5

3

1 6th

7th

8th

9th

10th

11th

12th

Grade

6. 4 hours

7. 1.5 hours

8. True

CK-12 Middle School Math Concepts - Grade 7

13

Answer Key

Chapter 11 – Data and Statistics 9.

Sales Tax Rate (%)

8 7 6 5 4 3 2 1 0 Alaska

Alabama

Arizona

California

New Jersey

California

New Jersey

State

10. ONE POSSIBLE ANSWER

Sales Tax Rate (%)

7.5 7 6.5 6 5.5 5 4.5 4 3.5 3 Alaska

Alabama

Arizona

State 11. New Jersey

12. No, because the purpose is to compare states that have sales tax.

CK-12 Middle School Math Concepts - Grade 7

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Answer Key

Chapter 11 – Data and Statistics 13. ONE POSSIBLE ANSWER 65

Temperature

63 61 59 57 55 53 51 49 47 1

2

3

4

5

6

7

8

9

10

7

8

9

10

Days 14. 70

Temperature

60 50 40 30 20 10 0 1

2

3

4

5

6

Days

CK-12 Middle School Math Concepts - Grade 7

15

Chapter 11 – Data and Statistics

Answer Key

15. 64 16. 49 17 – 20. Answers may vary

CK-12 Middle School Math Concepts - Grade 7

16

Answer Key

Chapter 11 – Data and Statistics 11.14

Data Display Choices

Answers 1. False

2. True

3. #1

4. $28,000

5. $31,000

6. #1

7. $28,000

8. Box and Whisker Plot

48

50

9. 36

42

45

49

56

58

59

62

10. 18 16 14 12 10

Series 1 Series 2

8

Series 3

6 4 2 0 1

2

3

4

CK-12 Middle School Math Concepts - Grade 7

5

6

17

Answer Key

Chapter 11 – Data and Statistics 11. 18 16 14 12 10

Series 1 Series 2

8

Series 3 6 4 2 0 1

12.

2

3

4

Number

Frequency

5

1

8

1

10

2

12

1

15

2

18

2

20

1

23

1

25

2

27

1

30

1

5

6

7

8

CK-12 Middle School Math Concepts - Grade 7

9

10

18

Answer Key

Chapter 11 – Data and Statistics 13. 2.5

2

1.5 Series 1 Series 2 Series 3 1

0.5

0 5

8

10

12

15

18

20

23

25

27

30

30 should have a bar to the number 1. It wouldn’t fit on this chart. 14. 5 8 10 10 12 15 15 18 18 20 23 25 25 27 30 15. 3

.5 .6 .6 .8

4

.1 .2 .3 .5 .6

5

.1

CK-12 Middle School Math Concepts - Grade 7

19

Answer Key

Chapter 11 – Data and Statistics 16. 6

5

4

Series 1 Series 2 3

Series 3 Series 4 Series 5

2

1

0 1

2

3

CK-12 Middle School Math Concepts - Grade 7

20

Answer Key

Chapter 11 – Data and Statistics 11.15

Displaying by Type of Data

Answers 1. 100 90 80 70 60 50

Series 1

40

Series 2

30

Series 3

20 10 0

2. 85%

3. 32%

4. 65%

5. 46%

6. Waikiki

7. Denver

8. Frequency Table

9.

0

4

1

3

2

7

3

6

4

4

5

4

6

2

10. 23% 11. 10%

CK-12 Middle School Math Concepts - Grade 7

21

Chapter 11 – Data and Statistics

Answer Key

12. 3 13. 4 14. 3% 15. 4% 16 – 20 Answers will vary

CK-12 Middle School Math Concepts - Grade 7

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