GRADE 7
Name:
Answer these questions in your class workbook.
1. The table below shows the cost of a phone call after a certain number of
minutes for two different cellular telephone companies:
Number of
1
minutes
Cost in
Rands
R2.50
Company
A
Cost in
Rands
R0.90
Company
B
2
3
4
5
6
7
8
9
R3.00
R3.50
R4.00
R4.50
R5.00
R5.50
R6.00
R6.50
R1.80
R2.70
R3.60
R4.50
R5.40
R6.30
R7.20
R8.10
Grade 7 Term 4: Data Handling; Displaying data
Drawing Graphs for Data
a) Draw a double bar graph to represent the information in the table.
b) Use your bar graph to answer these questions:
i) When is it cheaper to use cell phone company A?
ii) When does it cost the same amount to call from cell phone company A as it does to call from cell phone company B?
iii) If you were an advertising company, which part of the graph for
Company A would you show in your adverts?
2. A salesman sells 300 lamps altogether. He sells 100 small lamps, 150 medium sized lamps and 50 large lamps. Draw a pie chart to represent this information.
3. 50 Grade 7 pupils were asked about how much time they spent watching TV a day. The table below gives a summary of the information found.
Amount of Time in Hours
Less than 1 hour
Between 1 and 2 hours
Between 2 and 3 hours
Between 3 and 4 hours
Between 4 and 5 hours
Number of Children
8
12
15
11
4
a) Draw a histogram to represent the information in the table.
b) Draw a pie graph to represent the information in the table.
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c) Which graph do you think represents the information best? Give a reason for your
answer?
d) If you wanted to show that lots of children watch TV, would you make the
vertical scale on the histogram bigger or smaller? Give a reason for your
answer.
e) Your teacher does a similar table and asks the Grade 7 pupils how much time they spend studying or doing homework every day. The table below
shows her results:
Amount of Time in Hours
Less than 1 hour
Between 1 and 2 hours
Between 2 and 3 hours
Between 3 and 4 hours
Between 4 and 5 hours
Number of Children
23
14
8
5
0
GRADE 7
Grade 7 Term 4: Data Handling; Displaying data
Drawing Graphs for Data
i) Draw a double bar graph showing the number of hours that students spend studying and doing homework and the number of hours watching T.V.
ii) What do you notice?
iii) If you were the principal what would you use this double bar graph to prove to parents?
iv) Do you think the information shown in the table might change closer to exams? Why do you say so?
4. A DVD rental store measures how many DVDs are rented every month for 12 months from January to December.
January – 481 February – 195
September – 204
May – 178
June – 109
March – 288
April – 238
July – 510 August – 316
October – 163
November – 151
December – 451
a) Which graph do you think would represent this information best? A bar graph, histogram, or pie chart? Give a reason for your answer.
b) Draw a histogram to represent the information.
c) From the bar graph when do you think the schools were writing exams and why do you say so?
d) From the bar graph when do you think the schools were on holiday and why do you say so?
e) When did the DVD store rent the most DVDs?
© e-classroom 2014 www.e-classroom.co.za
Name:
Answer these questions in your class workbook.
1. The table below shows the cost of a phone call after a certain number of minutes for two different cellular telephone companies:
Number of
1
minutes
Cost in
Rands
R2.50
Company
A
Cost in
Rands
R0.90
Company
B
2
3
4
5
6
7
8
9
R3.00
R3.50
R4.00
R4.50
R5.00
R5.50
R6.00
R6.50
R1.80
R2.70
R3.60
R4.50
R5.40
R6.30
R7.20
R8.10
GRADE 7
Grade 7 Term 4: Data Handling; Displaying data
Drawing Graphs for Data: Answer Sheet
a) Draw a double bar graph to represent the information in the table.
b) Use your bar graph to answer these questions:
i) When is it cheaper to use cell phone company A?
When you phone for more than 5 minutes
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ii) When does it cost the same amount to call from cell phone company A as it does to call from cell phone company B?
At 5 minutes
iii) If you were an advertising company, which part of the graph for
Company A would you show in your adverts?
The part where the cost is shown for 5 minutes or more
2. A salesman sells 300 lamps altogether. He sells 100 small lamps, 150 medium sized lamps and 50 large lamps. Draw a pie chart to represent this information.
GRADE 7
Grade 7 Term 4: Data Handling; Displaying data
Drawing Graphs for Data: Answer Sheet (2)
3. 50 Grade 7 pupils were asked about how much time they spent watching TV a day. The table below gives a summary of the information found.
Amount of Time in Hours
Less than 1 hour
Between 1 and 2 hours
Between 2 and 3 hours
Between 3 and 4 hours
Between 4 and 5 hours
a)Draw a histogram to represent the information in the table.
Number of children
Number of Children
8
12
15
11
4
Amount of time in hours
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b) Draw a pie graph to represent the information in the table.
c) Which graph do you think represents the information best? Give a reason for your
GRADE 7
Grade 7 Term 4: Data Handling; Displaying data
Drawing Graphs for Data: Answer Sheet (3)
answer?
This is an opinion question – but students must give a logical and reasonable
answer.
E.g. for Histogram – the histogram represents the data better as it is easier to see how
many students spend their time watching TV and how much they are watching.
E.g. for Pie Chart – the pie chart represents the information best as you can see how
much TV the students are watching and compare it to the number of students watching
other amounts of TV.
d) If you wanted to show that lots of children watch TV, would you make the
vertical scale on the histogram bigger or smaller? Give a reason for your
answer.
I would make the scale smaller so that the bars of the histogram look taller so that it
would look like more children are watching TV.
e) Your teacher does a similar table and asks the Grade 7 pupils how much time
they spend studying or doing homework every day. The table below
shows her results:
Amount of Time in Hours
Less than 1 hour
Between 1 and 2 hours
Between 2 and 3 hours
Between 3 and 4 hours
Between 4 and 5 hours
© e-classroom 2014 Number of Children
23
14
8
5
0
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i) Draw a double bar graph showing the number of hours that students spend studying and doing homework and the number of hours watching TV
GRADE 7
Grade 7 Term 4: Data Handling; Displaying data
Drawing Graphs for Data: Answer Sheet (4)
ii) What do you notice?
Children spend more time watching TV than they spend studying and doing
homework.
iii) If you were the principal what would you use this double bar graph to prove to parents?
That children spend more time watching TV than studying.
iv) Do you think the information shown in the table might change closer to exams? Why do you say so?
Yes – because children are more likely to start studying more closer to the exams (this is a personal opinion question but this is the most logical and reasonable answer).
4. A DVD rental store measures how many DVDs are rented every month for 12 months from January to December.
January – 481 February – 195
March – 288
May – 178
July – 510 August – 316
September – 204
June – 109
October – 163
© e-classroom 2014 April – 238
November – 151 December – 451
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a) Which graph do you think would represent this information best? A bar graph, histogram, or pie chart? Give a reason for your answer.
A histogram because the months represent time which means that the
columns/ bars need to be next to each other, unlike in a bar graph
(continuous vs discrete data). There are too many items to make a pie chart
effective.
b) Draw a histogram to represent the information.
GRADE 7
Number of DVDs
Grade 7 Term 4: Data Handling; Displaying data
Drawing Graphs for Data: Answer Sheet (5)
Month
c) From the bar graph when do you think the schools were writing exams and why do you say so?
In June and October and November because this is when the DVD rentals are low probably because students are studying and not watching movies.
d) From the bar graph when do you think the schools were on holiday and why do you say so?
Schools were on holiday in January, July and December because lots of DVDs were rented. Students like to watch movies during their holidays.
e) When did the DVD store rent the most DVDs?
July
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