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4 th January 2008

4 th January 2008. Interpreting Pie Charts. Decide whether you agree with the following statements and give a reason. School A (1200 pupils). School B (1000 pupils). There are more pupils with mobile phones at School A. Class 7A (24 pupils). Class 7B (32 pupils). girls. boys. girls.

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4 th January 2008

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  1. 4th January 2008 Interpreting Pie Charts Decide whether you agree with the following statements and give a reason

  2. School A (1200 pupils) School B (1000 pupils) There are more pupils with mobile phones at School A.

  3. Class 7A (24 pupils) Class 7B (32 pupils) girls boys girls boys There are the same number of boys in both classes.

  4. Number of hours spent on homework last night for a class 4 0 0 3 1 2 2 A 1/3 of pupils spent more than 2 hours on homework last night.

  5. Pie Charts Objective: Be able to construct a pie chart from a collection of data, using a protractor.

  6. Makes of car in a school car park 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 = 36o

  7. Makes of car in a school car park 3x36o=108o 2x36o=72o 1x36o=36o 4x36o=144o We use 36o to represent each car so the3 Cavaliers are represented by 3x36o = 108o

  8. Makes of car in a school car park 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 Cavalier 108o

  9. Makes of car in a school car park 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. Volvo Cavalier 36o 108o Rover 144o 72o Ford

  10. 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?

  11. Construct Pie charts questions 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.

  12. 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?

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