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| Summary |
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 There are two types of frequency distribution. (a) Inclusive (b) Exclusive |
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| In the inclusive type, the upper limit of one class does not coincide with the lower limit of the next class. |
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| In the exclusive type, the upper limit of one class coincides with the lower limit of the next class. |
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Inclusive type of frequency distribution can be converted into exclusive type by extending the class limits by 0.5 |
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Class width is the difference between the actual limits of any class. |
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Class mark is the mid point of each interval. |
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