Transcript over Lesson 2-3

Five-Minute Check (over Lesson 2–3)
Main Idea and Vocabulary
Example 1: Construct a Stem-and-Leaf Plot
Example 2: Analyze Plots
• Display and analyze data using a stem-and-leaf
plot.
• stem-and-leaf plot
• stems
• leaves
• key
Construct a Stem-and-Leaf Plot
WEATHER Make a stem-and-leaf plot for the data in
the table below.
Step 1
Order the data from least to greatest.
66, 67, 69, 70, 71, 72, 73, 73, 74, 74, 75, 76,
77, 78, 79, 81, 88, 89
Construct a Stem-and-Leaf Plot
Step 2 Draw a vertical line
and write the tens
digits from least to
greatest to the left of
the line. These digits
form the stems.
Since the least value
is 66 and the
greatest value is 89,
the stems are 6, 7,
and 8.
Animation:
Construct a Stem-and-Leaf Plot
Construct a Stem-and-Leaf Plot
Step 3 Write the ones
digits in order to the
right of the line with
the corresponding
stem. The units
digits form the
leaves.
Step 4 Include a key that explains the stems and
leaves.
Construct a Stem-and-Leaf Plot
Answer:
DRIVING Make a stem-andleaf plot for the data in the
table.
0%
D
0%
A
B
0%C
D
C
D.
1.
2.
3.
0%
4.
B
C.
B.
A
A.
Analyze Plots
FOOTBALL The following stem-and-leaf plot shows
the total points scored in 39 recent Super Bowls.
Write a few sentences analyzing the data.
Analyze Plots
Sample answer:
The lowest point total is 21, and the
highest is 75. Most of the combined
scores are in the 30s, 40s, and 50s;
higher and lower point totals are more
unusual.
HOTEL RATES The following stemand-leaf plot shows nightly hotel rates
for a sample of hotels in a large
metropolitan area. Write a few
sentences that analyze the data.
C.
The most common nightly rate is $89.
Most of the rates are less than $80.
D.
The most common nightly rate is $75.
Most of the rates are more than $90.
0%
1.
2.
0%
3.
4.
A
B
0%
C
D
0%
D
The lowest nightly rate is $62, and the
highest is $95. Most of the rates are in
the $70s and $80s.
C
B.
B
The lowest nightly rate is $68, and the
highest is $91. Most of the rates are in
the $80s and $90s.
A
A.
End of the Lesson
Five-Minute Check (over Lesson 2–3)
Image Bank
Math Tools
Construct a Stem-and-Leaf Plot
Making Predictions from Graphs
(over Lesson 2-3)
Based on the trend in the
graph, will the enrollment in
2006 be higher or lower than in
2005?
A. equal
B. higher
1.
2.
3.
C. lower
0%
C
0%
B
A
0%
A
B
C
(over Lesson 2-3)
Based on the trend in the graph,
predict the enrollment in 2006
and in 2007.
A. 120; 130
B. 125; 135
1.
2.
3.
4.
C. 130; 140
0%
D
0%
C
0%
B
D. 130; 145
A
0%
A
B
C
D
(over Lesson 2-3)
Based on the graph, about how
many students were enrolled in
2000?
A. 50
B. 45
1.
2.
3.
4.
C. 40
0%
D
0%
C
0%
B
D. 30
A
0%
A
B
C
D
(over Lesson 2-3)
Based on the trend in the graph,
predict how many years after
2005 it will take to reach an
enrollment of 200 students.
A. 9 years
B. 6 years
1.
2.
3.
4.
C. 5 years
0%
0%
D
0%
C
A
0%
B
D. 4 years
A
B
C
D
(over Lesson 2-3)
Based on the trend in the graph,
predict how many flowers will be
on the bush in week 7.
A. 60
B. 45
1.
2.
3.
4.
C. 40
D. 35
0%
D
0%
C
0%
B
A
0%
A
B
C
D