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Answer Key
Name
4
Click Here
Date
LESSON
Class
Practice B
6-9 Stem-and-Leaf Plots
Complete each activity and answer the questions.
1. Use the data in the table to complete the stem-and-leaf plot
below.
Richmond, Virginia, Monthly Normal Temperatures (°F)
Jan
Feb
Mar
April
37
39
48
57
May June
74
78
July
Aug
Sep
Oct
Nov
Dec
77
76
70
59
50
40
Stem Leaves
Key: 1 | 2 Find each value of the data set.
2. smallest value
Stem Leaves
3. largest value
6 1
4
4. mean
7 1
6
5. median
8 2
2
9 0 1 8
6. mode
Key: 6 | 5 65
7. range
8. Look at the stem-and-leaf plot you
made for Exercise 1. How many
months in Richmond have a normal
temperature above 70°F?
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
9. How would you display a data value
of 100 on the stem-and-leaf plot
above?
85
Holt Middle School Math Course 1
Chapter Menu
Lesson Plan
Print document
Practice A
6-9 Stem-and-Leaf Plots
Exploration Recording Sheet
6-9 Stem-and-Leaf Plots
LESSON
LESSON
Complete each activity and answer each question.
The table shows the times in seconds and hundredths of seconds
for the women’s 500-meter speed-skating competition in the 2002
Winter Olympics.
1. Use the data in the table to complete the stem-and-leaf plot
below.
74.75
74.94
75.19
75.37
75.39
75.64
75.64
76.17
76.20
76.31
76.37
76.42
76.62
76.73
76.73
76.86
76.92
77.10
77.37
77.60
77.60
77.71
78.26
78.63
78.79
78.89
79.28
79.45
79.45
Daily Low Temperatures (°F)
16
1. Complete the stem-and-leaf plot. The stems represent seconds
and the leaves represent hundredths of seconds. Notice how the
colors correspond to the colors used in the table.
27
30
25
Leaves
1 5
2 1
3 0
You can organize the data by seconds and hundredths of seconds.
Notice how the times are grouped using different colors.
15
Check students’ stem-and-leaf plots.
Daily Low Temperature
Stem
21
6
5
7
16°F
Key: 1 | 6 Find each value of the data set.
10
45
2. smallest value
Stems
Leaves
3. largest value
74
75 94
75
19 37 39 64 64
17 20 31 37 42 62 73 73 86 92
10 37 60 60 71
26 63 79 89
28 45 45
76
77
78
79
Key: 74
4. mean
5. median
6. mode
7. range
75 means 74.75
Stem Leaves
1 0 5
26
23
none
35
2 3
3 7
4 5
Key: 2 | 4 24
8. In the stem-and-leaf plot for
Exercises 2–7, which digit was used
for the stems? for the leaves?
Think and Discuss
2. Explain what it means in this case for a stem to have the most
number of leaves.
9. Look at the stem-and-leaf plot you
made for Exercise 1. What are the
smallest and largest values in the
data set?
stems: tens; leaves: ones
smallest: 15; largest: 30
More speedskaters finished in that many seconds.
3. Explain what it means in this case for a stem to have the least
number of leaves.
The fewest number of speedskaters finished in that many seconds.
83
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
Holt Middle School Math
Course 1
Practice B
6-9 Stem-and-Leaf Plots
84
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
Holt Middle School Math
Course 1
Practice C
6-9 Stem-and-Leaf Plots
LESSON
LESSON
Complete each activity and answer the questions.
Complete each activity and answer the questions.
1. Use the data in the table to complete the stem-and-leaf plot
below.
1. Use the data in the table to make a stem-and-leaf plot.
Books Read by Read-A-Thon Participants
Richmond, Virginia, Monthly Normal Temperatures (°F)
Jan
Feb
Mar
April
37
39
48
57
May June
74
78
July
Aug
Sep
Oct
Nov
Dec
77
76
70
59
50
40
50
19
24
45
44
12
32
19
38
43
35
40
15
19
26
30
28
40
12
18
Stem Leaves
Stem Leaves
3
4
5
6
7
7 9
0 8
0 7
0
Key: 1 | 2 1
2
3
4
5
9
4 6
12°F
7
8
2
4
0
0
0
Key: 1 | 2 2
6
2
0
5
8
5
3
8
9
8
4
5
9
9
12
Find each value of the data set.
Find each value of the data set.
2. smallest value
3. largest value
4. mean
5. median
6. mode
7. range
2. smallest value
61
98
Stem Leaves
3. largest value
6 1 4
79.4
82
82
37
4. mean
7 1 6
5. median
8 2 2
6. mode
9 0 1 8
7. range
Key: 6 | 5 65
8. Look at the stem-and-leaf plot you
made for Exercise 1. How many
months in Richmond have a normal
temperature above 70°F?
9. How would you display a data value
of 100 on the stem-and-leaf plot
above?
4 months
12
52
27.5
25.5
28
40
Stem Leaves
1 2 5 8 9
2 0 4 5 6 8 8
3 2 6
5 0 2
Key: 3 | 3 33
8. Look at the stem-and-leaf plot you
made for Exercise 1. How many
students read more than 40 books
during the read-a-thon?
9. How would you display a data value
of 5 on the stem-and-leaf plot above?
What would be the mean of this new
data set?
4 students
Use 10 for the stem and 0 for
Use 0 for the stem and 5 for
the leaf; mean: 26
the leaf.
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
85
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
Holt Middle School Math Course 1
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
115
86
Holt Middle School Math
Holt Middle School Math
Course 1
Course 1