Chapter 11 Data and Statistics Answer Key

Chapter 11 – 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 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



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



11.9 Stem-and-Leaf Plots

Answers

1. 2 2 5 7 9

3 1 4 4 9

4 0 4

2. 6 5

7 2

8 6 8 9

9 0 1 6

10 0 1

3. 0 4 6 6 7 8 9

1 1 2 5

2 0

4. 9.8

5. 7.5

6. 6

7. 16

8. 2 1 5 6 7 9 9

3 1 4 6 8 9

4 0

9. 31.25

10. 30



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



11.10 Box – and – Whisker Plots

Answers

1. 22 2. 15 3. 28 4. 12 5. 31

6.

26 27 29 30 32 35 41 42 44

7. 32

8. 28

9. 41.5

10. 26

11. 44

12.

100 105 107 109 110 120

13. 108 14. 105 15. 110 16. 100 17. 120



11.11 Frequency Tables to Organize and Display Data

Answers

1. 174 2. 5 days 3. 1 day

4. Days Frequency

0 15

1 13

2 30

3 21

4 35

5 60

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



12. 7

13. 4

14. 7

15. False

16. False



11.12 Histograms

Answers

1.

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

Series 1

Series 2

Series 3



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



3.

4.

Number Frequency

3 3

4 1

5 1

7 1

8 1

9 2

10 1

11 1

12 1

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

2 3 4 5 6 7 8 9 10 11 12 13 14 15

Series 1

Column1

Column2



5.

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

0

0.5

1

1.5

2

2.5

3

3.5

3 4 5 6 7 8 9 10 11 12

Series 1

Series 2

Series 3



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.

0

0.5

1

1.5

2

2.5

3

3.5

4

6th 7th 8th 9th 10th 11th 12th

Tim

e

Grade



5. ONE POSSIBLE ANSWER

6. 4 hours 7. 1.5 hours 8. True

1

3

5

7

9

11

13

15

6th 7th 8th 9th 10th 11th 12th

Tim

e

Grade



9.


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

0

1

2

3

4

5

6

7

8

Alaska Alabama Arizona California New Jersey

Sale

s Ta

x R

ate

(%

)

State

3

3.5

4

4.5

5

5.5

6

6.5

7

7.5

Alaska Alabama Arizona California New Jersey

Sale

s Ta

x R

ate

(%

)

State




14.

47

49

51

53

55

57

59

61

63

65

1 2 3 4 5 6 7 8 9 10

Tem

pe

ratu

re

Days

0

10

20

30

40

50

60

70

1 2 3 4 5 6 7 8 9 10

Tem

pe

ratu

re

Days



15. 64

16. 49

17 – 20. Answers may vary



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

9.

36 42 45 48 49 50 56 58 59 62

10.

0

2

4

6

8

10

12

14

16

18

1 2 3 4 5 6

Series 1

Series 2

Series 3



11.

12. Number Frequency

5 1

8 1

10 2

12 1

15 2

18 2

20 1

23 1

25 2

27 1

30 1

0

2

4

6

8

10

12

14

16

18

1 2 3 4 5 6 7 8 9 10

Series 1

Series 2

Series 3



13.

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

0

0.5

1

1.5

2

2.5

5 8 10 12 15 18 20 23 25 27 30

Series 1

Series 2

Series 3



16.

0

1

2

3

4

5

6

1 2 3

Series 1

Series 2

Series 3

Series 4

Series 5



11.15 Displaying by Type of Data

Answers

1.

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%

0

10

20

30

40

50

60

70

80

90

100

Series 1

Series 2

Series 3



12. 3

13. 4

14. 3%

15. 4%

16 – 20 Answers will vary

Chapter 11 Data and Statistics Answer Key

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