There are two methods of classifying the data according to class – intervals, namely exclusive method and Inclusive method.
1. Exclusive method:
This method is useful whether the value is complete number or in decimals. In case of exclusive series, value of the upper limit of a class is included in the lower limit of the next class interval. Value of the upper limit of the class is included in that very class interval.
2. Inclusive series :
In inclusive series value of the upper limit of a class is included in that very class interval. Inclusive series is useful when value is an incomplete number.
