Lesson 8-7 for exercise sets. &KDSWHU 3UDFWLFH $FWLYLWLHVMean Mathematics Test Scores
for Ms. Perry’s Students
85.5 75.5 75.4 95.0
75.5 83.8 85.0 92.5
87.2 68.3 89.2 95.2
89.5 78.8 85.3 83.7
92.3 95.2 92.5 87.6Key: 68 | 3 68.3Mean Mathematics Test Scores
for Ms. Perry’s Students
Stem Leaves
68
75
78
83
85
87
89
92
953
455
8
78
035
26
25
355
022Key:51 floors 1 | 5 | 0 50 floorsNumber of Floors in Buildings
City 1 City 2
Leaves Stem Leaves
96321
752
3 13
4
52267
0 2 3
026Both cities have a 42-floor building.
City 1’s tallest building has 53 floors.
City 2’s tallest building has 56 floors.Ages of Presidents
George Washington 57
John Adams 60
Thomas Jefferson 57
James Madison 57
James Monroe 58
John Quincy Adams 57
Andrew Jackson 62
Martin Van Buren 54
William H. Harrison 68
John Tyler 51The ages of the first 10 American presidents at the start
of their presidencies are given at the right.
Use the data to make a stem-and-leaf plot.
Then answer the questions.
1.What are the range and mode of the data?
2.How many of the presidents were at least 60 years old at the
start of their presidencies?
3.What is the median age of the first 10 presidents at the start
of their presidencies?
4.Discuss and Write Describe how you would make a stem-and-leaf
plot using the numbers 2.6, 2.8, 1.4, 3.6, 1.9, 2.2, and 3.2.Make a stem-and-leaf plot to display the mean
mathematics test scores for Ms. Perry’s class
of 20 students.- First order the scores from least to greatest.
68.3, 75.4, 75.5, 75.5, 78.8,
83.7, 83.8, 85.0, 85.3, 85.5, 87.2, 87.6,
89.2, 89.5, 92.3, 92.5, 92.5, 95.0, 95.2, 95.2 - Give the stem-and-leaf plot a title.
- Use the ones and tens for the stem
and the tenths for the leaves. - Write a key to show the relation
of digits.
Two sets of data can be compared using a.
This type of plot shows leaves on both sides of the stem. The plot below shows
data about buildings in two cities.back-to-back stem-and-leaf plot1