1. In case of exclusive servies, the upper limit of one class interval is the lower limit of the next class interval.
2. In case of exclusive series, value of the upper limit of a class is included in the lower limit of the next class interval. In inclusie series value of the upper limit of a class is included in that very class interval.
3. Exclusive series is useful whether the variables complete number or in decimals, but inclusive series is useful only when value is in complete number.
