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

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

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

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

Makes of car in a school car park MakeCavalierFordRoverVolvo Frequency3241 Construct a pie chart to show this information. A full circle is 360 o There are a total of = 10 cars. So each pupil will be represented by = 36 o

Makes of car in a school car park MakeCavalierFordRoverVolvo Frequency3241 Angle in pie chart We use 36 o to represent each car so the 3 Cavaliers are represented by 3x36 o = 108 o 3x36 o =108 o 2x36 o =72 o 4x36 o =144 o 1x36 o =36 o

Makes of car in a school car park MakeCavalierFordRoverVolvo Angle108 o 72 o 144 o 36 o Mark the centre of the pie and draw the circle. Draw a line from the centre to the edge Measure the first angle needed (108 o ) Draw in the line and label the section 108 o Cavalier

Makes of car in a school car park MakeCavalierFordRoverVolvo Angle108 o 72 o 144 o 36 o 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. 72 o Cavalier Ford 144 o Rover 36 o Volvo 108 o

Why? Why do we use 36 o 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 MethodWalkCycleCarBus Frequency15564 HowGamesClothesBooksCinema Amount£6£19£9£6 AnimalGiraffeWildebeestLionZebra Frequency111969

The pie chart shows which sport 36 pupils played yesterday. 120 o 80 o 30 o What is the size of the missing angle? What angle represents one pupil? How many pupils played football?