Why should the number of classes in a frequency distribution be between5 and 20?

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A table that provides information about the classes of data along with their respective frequencies is termed a frequency distribution table. Each class has a lower class limit and an upper-class limit.

In case when the number of classes is not given, then it is decided on the basis of the data available. This numeric quantity should be between 5 and 20. It helps in identifying patterns in the graph.

It is required to explain the reason behind using the number of classes in a frequency distribution between 5 and 20.