Transcript 3CH9L5

9-5 Displaying Data
Warm Up
Write each fraction as a decimal.
2
0.4
1.
5
49
2.
50
0.98
3. 3
4. 7
0.7
50
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10
9-5 Displaying Data
Problem of the Day
Your job at the local library is to shelve
the returned books. To correctly put the
books on the shelves, you need to
arrange them in order according to their
numbers. Which order is correct? C
A. 342.3, 342.5, 342.48, 342.52
B. 342.21, 342.47, 342.4, 342.59
C. 342.1, 342.17, 342.56, 342.76
D. 342.34, 342.43, 342.567, 342.56
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9-5 Displaying Data
TB P. 485-488
Learn to display data in bar graphs,
histograms, and line graphs.
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9-5 Displaying
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Data
Vocabulary
double-bar graph
frequency table
histogram
double-line graph
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9-5 Displaying Data
A double-bar graph is used to display
and compare two sets of data. You can
organize data using a frequency table
by listing items according to the number
of times the items occur.
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9-5 Displaying Data
Additional Example 1: Displaying Data in a
Double-Bar Graph
Make a double-bar graph.
The following are the number of books read in one
month by some boys and girls in Grade 8.
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Books read
0
1
2
3 4 5
Boys
2
3
3
1 0 1
Girls
2
1
2
4 1 0
9-5 Displaying Data
Additional Example 1 Continued
Make a double-bar graph.
The frequencies
are the heights
of the bars in
the graph. Use a
different color to
represent each
gender.
Frequency
4
3
Boys
Girls
2
1
0
0
1
2
3
4
Books read
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9-5 Displaying Data
A histogram is a bar graph that shows
the frequency of data within equal
intervals.
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9-5 Displaying Data
Additional Example 2: Displaying Data in a Histogram
Jimmy surveyed 12 children to find out how
much money they received from the tooth
fairy. Use the data to make a histogram.
0.35 2.00 0.75 2.50 1.50 3.00
0.25 1.00 1.00 3.50 0.50 3.00
First, make a frequency table with intervals of
$1.00. Then make a histogram.
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9-5 Displaying Data
Additional Example 2 Continued
0.35 2.00 0.75 2.50 1.50 3.00
0.25 1.00 1.00 3.50 0.50 3.00
Money ($)
0 – 0.99
1.00 – 1.99
2.00 – 2.99
3.00 – 3.99
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Frequency
4
3
2
3
9-5 Displaying Data
Additional Example 2 Continued
Frequency
Helpful Hint
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Histograms do not have
spaces between the
bars.
9-5 Displaying Data
A double-line graph is used to show
how two related sets of data change
over time.
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9-5 Displaying Data
Additional Example 3: Displaying Data in a
Double-Line Graph
Make a double-line graph of the given data.
Use the graph to estimate the number of CDs
and DVDs sold in 2003.
The Music Shop CD and DVD Sales
Year
CD’s Sold
DVDs Sold
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1998
3002
735
2000
3098
1057
2002
4685
3010
2004
5804
4047
9-5 Displaying Data
Additional Example 3 Continued
Plot the data.
The Music Shop CD and DVD Sales
7000
Number Sold
6000
5000
4000
CD
DVD
3000
2000
1000
0
1998
2000
2002
Year
2004
The graph shows about 5,250 CDs and 3,500 DVDs
were sold in 2003.
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9-5 Displaying
Data
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Lesson Quiz: Part I
1. Make a histogram with intervals of 5 using the
following data set: 7, 12, 8, 4, 4, 3, 6, 1, 14, 19,
8, 9
8
Units
Frequency
7
0-4
4
6
5-9
5
5
10-14
2
4
15-19
1
3
2
1
0-4
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5-9 10-14 15-19
9-5 Displaying
Data
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Lesson Quiz: Part II
2. Estimate the temperature on January 6 in
2004 and 2005 using the graph below.
2005: 31°C, 2004: 30°C
Degrees Celcius
Temperature Highs in January
2004 and 2005
34
32
30
28
26
24
2004
2005
1
3
5
January
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9
9-5 Displaying
Data
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Lesson Quiz: Part III
Use the graph for problems 3–4.
Sue's and Ana's Weekly Exercise
30
25
20
Minutes 15
Sue
Ana
10
5
0
M
T
W
Th
F
Sa Su
Days
3. On what day did both girls exercise for 30 minutes?
Friday
4. On what day(s) did Ana exercise longer than Sue?
Monday, Wednesday, Thursday, and Saturday
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