Why should the number of classes in a frequency distribution be between 5 and 20?

To allow for easy segregation, analysis, detecting patterns and understanding of the data

Step-by-step explanation:

Classes are, in simple terms, grouping of data based on certain unique characteristics.

Frequencies in classes are the amount of times that said characteristic occurs in an amount of event

The reasons the number of classes is set to between 5 and 20 is to allow for easy segregation, analysis, detecting patterns and understanding of the data