# if the value is equal to the class boundary where should it be placed?

As we all know class boundaries must overlap. My Question is if the value is equal to the class boundary where should it be placed? Following example contains class number, class and class boundaries respectively e.g

1. 1-2 0.5-2.5
2. 3-4 2.5-4.5
3. 5-6 4.5-6.5

If I have value 2.5 in which Class number should it be placed?

Strictly speaking, you need for classes to be defined so they are disjoint. For example: $(0.5, 2.5], (2.5, 4.5], (4.5, 6.5]$ or $[0.5, 2.5), [2.5, 4.5), [4.5, 6.5).$