Answer Key
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
1
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
2
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
3
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
7
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
8
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
14
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
22
