Starter: Interpreting Pie Charts Decide whether you agree with the following statements and give a...
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Transcript of Starter: Interpreting Pie Charts Decide whether you agree with the following statements and give a...
Starter:
Interpreting Pie ChartsInterpreting Pie Charts
Decide whether you agree with the following statements and give a reason
There are more pupils with mobile phones at There are more pupils with mobile phones at School A.School A.
School A (1200 pupils) School B (1000 pupils)
There are the same number of boys in both classes.There are the same number of boys in both classes.
Class 7A (24 pupils) Class 7B (32 pupils)
boys boysgirls
girls
Number of hours spent on homework last night for a class
A 1/3 of pupils spent more than 2 hours on homework last night.
2
00
1
2
3
4
Pie Charts
Be able to construct a pie chart from a collection of data, using a
protractor.
Makes of car in a school car park
Make Cavalier Ford Rover Volvo
Frequency 3 2 4 1
Construct a pie chart to show this information.
A full circle is 360o
There are a total of 3+2+4+1 = 10 cars.
So each pupil will be represented by
10
360o= 36o
Makes of car in a school car park
Make Cavalier Ford Rover Volvo
Frequency 3 2 4 1
Angle in pie chart
We use 36o to represent each car so the3 Cavaliers are represented by 3x36o = 108o
3x36o
=108o
2x36o
=72o4x36o
=144o
1x36o
=36o
Makes of car in a school car park
Make Cavalier Ford Rover Volvo
Angle 108o 72o 144o 36o
Mark the centre of the pie and draw the circle.
Draw a line from the centre to the edge
Measure the first angle needed (108o)
Draw in the line and label the section
108oCavalier
Makes of car in a school car park
Make Cavalier Ford Rover Volvo
Angle 108o 72o 144o 36o
From this line measure the next angle, draw the line and label the section.
Continue in this way
Check that the last section has the correct angle and label it.
72o
Cavalier
Ford
144oRover
36o
Volvo
108o
Why?• Why do we use 36o to represent 1 car?
• What would happen if there were 60 cars?
• What about 20 cars?
If there were 20 cars in your survey, what angle would you use to represent 4 cars? 7 cars? 12 cars?
Q1 A survey of how 30 pupils got to school
Q2 How Cameroon spent his £40 birthday money
Q3 A warden made 45 Sightings at a Wildlife park.
Construct Pie charts questions
Method Walk Cycle Car Bus
Frequency 15 5 6 4
How Games Clothes Books Cinema
Amount £6 £19 £9 £6
Animal Giraffe Wildebeest Lion Zebra
Frequency 11 19 6 9
The pie chart shows which sport 36 pupils played yesterday.
120o
80o
30o
What is the size of the missing angle?
What angle represents one pupil?
How many pupils played football?