Definitions [3]
A Pictograph is a chart that uses pictures or symbols to represent data. Each picture stands for a specific number of items, making the data easy to understand at a glance.
Double bar graph: A double bar graph is a graphical display of information using two bars beside each other at various heights.
Line graph: A line graph displays data that changes continuously over periods of time.
Formulae [1]
\[\text{Central angle}=\frac{\text{Value of component}}{\text{Total value}}\times360^\circ\]
Key Points
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A pie diagram represents data using a circle.
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The whole circle = total data = 360°.
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Each part of the data is shown by a sector.
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The central angle of a sector is proportional to the data value.
- Larger value → larger sector, smaller value → smaller sector.
- A Histogram is a graphical representation of a grouped frequency distribution using rectangles.
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It is used for continuous grouped data.
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Class intervals are shown on the X-axis.
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Frequencies are shown on the Y-axis.
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Rectangles are drawn without gaps between them.
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The height of each rectangle is proportional to its frequency.
