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- In a simple bar graph, the height of each bar represents the frequency.
The thickness has no significance. All bars to have the same thickness.
- We use double bar graph when we want to compare two things.
- In the pie chart,
- In the frequency polygon, the frequency is plotted against the mid value of each class. These points are joined by line segments.
- For a histogram, we mark class intervals on X axis and frequencies on Y axis. Class intervals must be exclusive. We draw rectangles with class intervals as bases and corresponding frequencies as heights.
