What is a Pie Chart A pie chart is a circular chart pieshaped it is split into segments to show percentages or the relative contributions of categories of data How do I draw a pie chart ID: 365879
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Slide1
Creating and Understanding Pie ChartsSlide2
What is a Pie Chart?
A pie chart is a circular chart (pie-shaped); it is split into
segments to show percentages or the relative contributions of categories of data.Slide3
How do I draw a pie chart?
Step 1
Decide on the total number of categories. In other words, identify the categories that you will use.
Collect the data so the number per category can be counted (Frequency Table)
Brand Name
Tally
Frequency
Daz
|||| |||| |||| |||| |||| |||| |||| ||||40Ariel |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| |||| ||||60Bold|||| |||| |||| |||| |||| |||| |||| |||| |||| ||||50Fairy|||| |||| |||| |||| ||||30Other |||| |||| |||| ||||20TOTAL200Slide4
How do I draw a pie chart?
Step 2
Brand Name
Units sold / year in 10
6
Degree Share
Daz
40
x 360 = 72oAriel60 x 360 = 108oBold50 x 360 = 90oFairy30 x 360 = 54oOther20 x 360 = 36oTotal200
Total = 360
o
To calculate degree share, you need to divide the share that the category has by the total units and then multiply by 360 (there are 360 degrees (°) in a circle).
40
200
60
200
50
200
30
200
20
200Slide5
How do I draw a pie chart?
Step 3 – Drawing the chart
1
st
Draw a Circle
With a protractor measure 72
o
Mark this angle and draw a line from the centre to the mark
Turn the protractor so that the zero is now on this lineNow measure 108oNow measure 90oAnd finally 54oYou should now be left with 36oAgain, turn the protractor so that zero is now on this lineAgain, turn the protractorLightly, draw a vertical line through the centrePlease note that due to the limitations of the software some measurements on this screen are not totally accurate. Slide6
How do I draw a pie chart?
Step4
It may be necessary to work out the percentage and include this in the labelling. How would we do this?
Brand Name
Units sold / year in 10
6
% age
Daz
40(40 ÷ 200) x 100 = 20%Ariel60(60 ÷ 200) x 100 = 30%Bold50(50 ÷ 200) x 100 = 25%Fairy30(30 ÷ 200) x 100 = 15%Other20(20 ÷ 200) x 100 = 10%Total200
To calculate degree share, you need to divide the share that the category has by the total units and then multiply by 100 (the whole circle is equal to 100%). Slide7Slide8
Exercises
Use a pie chart to illustrate the data given below, fully label the chart and show the percentage value of each sector.
180 FE college students were asked what they intended to do next year.
54
Going to university
40
Staying at college
62
Going into employment24No firm intentionSlide9
Exercises
At a concert, the ages of 115 people were recorded as:
Under 20
15
20 - 29
30
30 - 39
22
40 - 592460 and over24Draw a pie chart using this data, give the data labels values in % agesSlide10
Thirty people were surveyed in a shopping centre and asked their ages. These are displayed below.
54 41 65 46 66 37
32 71 34 73 15 26 64 22 54 8 58 43
14 57 43 52 24 68
43 39 59 35 48 49
a) Draw a tally-frequency table.
b) Using the data in your frequency table, construct a table to calculate the angles in a pie chart.
c) draw and fully labelled a pie chart to show the percentage values.