10.1 Exercises
Help with Homework
1. VOCABULARY The key for a stem-and-leaf plot is 3 | 4 = 34. Which number
is the stem? Which number is the leaf ?
2. WRITING Describe how to make a stem-and-leaf plot of the data values
14, 22, 9, 13, 30, 8, 25, and 29.
3. WRITING How does a stem-and-leaf plot show the distribution of data?
6)=3
9+(- 3)=
3+(- 9)=
4+(- =
1)
9+(-
Make a stem-and-leaf plot of the data.
1
4.
5.
Books Read
Hours Online
26
15
20
9
8
12
21
14
31
25
29
32
18
6
15
24
17
26
19
40
12
17
2
0
6.
7.
Test Scores (%)
Points Scored
87
82
95
91
69
58
50
42
71
75
88
68
87
65
81
45
51
43
38
71
97
85
80
90
62
42
70
56
58
43
8.
9.
Bikes Sold
Minutes in Line
78
112
105
99
4.0
2.6
1.9
3.1
86
96
115
100
3.6
2.2
2.7
3.8
79
81
99
108
1.6
2.0
3.1
2.9
10. ERROR ANALYSIS Describe and correct the error
in making a stem-and-leaf plot of the data.
51, 25, 47, 42, 55, 26, 50, 44, 55
✗
Stem
2
4
5
Leaf
5 6
2 4 7
0 1 5 5
Key: 4 2 = 42
11. PUPPIES The weights (in pounds) of eight puppies
at a pet store are 12, 24, 17, 8, 18, 31, 24, and 15.
Make a stem-and-leaf plot of the data. Describe the
distribution of the data.
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Chapter 10
Data Displays
VOLLEYBALL The stem-and-leaf plot shows
the number of digs for the top 15 players at
a volleyball tournament.
Stem
4
5
6
7
8
9
2 12. How many players had more than 60 digs?
13. Find the mean, median, mode, range, and
interquartile range of the data.
14. Describe the distribution of the data.
Leaf
1 1 3 3 5
0 2 3 4
2 3 3 7
5
7
Key: 5 | 0 = 50 digs
15. Which data value is the outlier? Describe how
the outlier affects the mean.
16. REASONING Each stem-and-leaf plot below has a mean of 39.
Without calculating, determine which stem-and-leaf plot has
the lesser mean absolute deviation. Explain your reasoning.
Stem
2
3
4
5
Leaf
3
0
1
1
Stem
7
2 6 9
2 5 8
4
2
3
4
5
Key: 4 | 1 = 41
Leaf
2 4 5 8 9
3 8
5
3 6 7 8
Key: 5 | 3 = 53
17. TEMPERATURE The stem-and-leaf plot shows the daily
high temperatures (in degrees Fahrenheit) for the first
15 days of a month.
Stem
6
7
8
a. Find and interpret the mean absolute deviation of
the data.
Leaf
7 8
0 0 3 4 6 8 9
2 3 6 7 8 9
Key: 6 | 7 = 67°F
b. After you include the daily high temperatures for the rest of the
month in the stem-and-leaf plot, the mean absolute deviation
increases. Where do you think most of the data values for the rest
of the month are located in the stem-and-leaf plot? Explain.
18.
Rich
Will
The back-to-back stem-and-leaf plot
shows the 9-hole golf scores for two golfers. Only
7 5 3
one of the golfers can compete in a tournament. 8 5 4 3 2 1 4 2 3 4 4 6 7 7 8 9
Use measures of center and measures of variation
5 0 5 0
to give reasons why you would choose each golfer.
Key: 1 | 4 | 2 = 41 and 42 strokes
Draw the solid. (Section 8.1)
19. square pyramid
20. hexagonal prism
21. MULTIPLE CHOICE In a bar graph, what determines the length of each bar?
(Skills Review Handbook)
A frequency
○
B data value
○
C leaf
○
Section 10.1
D change in data
○
Stem-and-Leaf Plots
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