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Reading-And-Interpreting-Statistical-Diagrams Wjec-Eduqas Foundation
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Time-Series-Graphs- Wjec-Eduqas Foundation
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Pie-Charts- Wjec-Eduqas Foundation
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Frequency-Polygons Wjec-Eduqas Foundation
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Bar-Charts-And-Pictograms- Wjec-Eduqas Foundation
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Pie-Charts- Wjec-Eduqas Foundation
Exam code:C300
Pie charts
What is a pie chart?
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A pie chart is a circle divided into sectors which is used to present data
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The sectors represent different categories
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They show the relative proportions of the categories
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They do not show the actual frequencies of each category
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How do I draw a pie chart?
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This is easiest explained through an example
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The following data shows the favourite colours of a class of students
|
Colour |
Red |
Purple |
Blue |
Green |
Yellow |
Orange |
|---|---|---|---|---|---|---|
|
Students |
11 |
4 |
9 |
3 |
2 |
1 |
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Write the frequencies as fractions of the total number of students, 30
|
Colour |
Red |
Purple |
Blue |
Green |
Yellow |
Orange |
|---|---|---|---|---|---|---|
|
Students |
11 |
4 |
9 |
3 |
2 |
1 |
|
Fractions |
|
|
|
|
|
|
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Find the angles of the sectors by multiplying each fraction by 360°
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Then check all angles add up to 360°
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|
Colour |
Red |
Purple |
Blue |
Green |
Yellow |
Orange |
|---|---|---|---|---|---|---|
|
Students |
11 |
4 |
9 |
3 |
2 |
1 |
|
Fractions |
|
|
|
|
|
<img alt=”1 over 30″ data-mathml='<math ><semantics><mfrac><mn>1</mn><mn>30</mn></mfrac><annotation encoding=”application/vnd.wiris.mtweb-params+json”>{“language”:”en”,”fontFamily”:”Times New Roman”,”fontSize”:”18″,”autoformat”:true}</annotation></semantics></math>’ height=”47″ role=”math” src=”data:image/svg+xml;charset=utf8,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20xmlns%3Awrs%3D%22http%3A%2F%2Fwww.wiris.com%2Fxml%2Fmathml-extension%22%20height%3D%2247%22%20width%3D%2227%22%20wrs%3Abaseline%3D%2230%22%3E%3C!–MathML%3A%20%3Cmath%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmfrac%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E30%3C%2Fmn%3E%3C%2Fmfrac%3E%3C%2Fmath%3E–%3E%3Cdefs%3E%3Cstyle%20type%3D%22text%2Fcss%22%3Etext%7Bfill%3A%23000000%3B%7D%3C%2Fstyle%3E%3C%2Fdefs%3E%3Cline%20stroke%3D%22%23000000%22%20stroke-linecap%3D%22square%22%20stroke-width%3D%221%22%20×1%3D%222.5%22%20×2%3D%2223.5%22%20y1%3D%2223.5%22%20y2%3D%2223.5%22%2F%3E%3Ctext%20font-family%3D%22Times%20New%20Roman%22%20font-size%3D%2218%22%20text-anchor%3D%22middle%22%20x%3D%2213.5%22%20y%3D%2216%22%3E1%3C%2Ftext%3E%3Ctext%20font-family%3D%22Times%20New%20Roman%22%20font-size%3D%2218%22%20text-anchor%3D%22middle%22%20x%3D%2213.5%22%20y%3D%2241%22%3E30%3C%2Ftext%3E%3C% |
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