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Discrete Frequency Distribution: Discrete data is generated by counting; each and every observation is exact. When an observation is repeated. It is counted the number for which the observation is repeated is called frequency of that observation. The class limits in discrete data are true class limit; there are no class boundaries in discrete data.

Continuous frequency distribution: The frequency distribution of a discrete quantitative variable may be summarized in a bar chart, as explained in the last section. The frequency distribution of a continuous quantitative variable can be constructed in the same way by first grouping the observations.  That is, by choosing a set of contiguous non-overlapping intervals, called class intervals, the observations can be grouped to form a discrete variable from the continuous variable.