Question

IF THE CLASSES ARE 10-20, 20-30, 30-40... THEN IN WHICH CLASS SHOULD THE OBSERVATION 30 BE INCLUDED. ​

Answer 1

Answer:

I didn't understood your question BTW

I can tell you one thing for your better understanding about this that for second class (20-30) 30 will be the upper limit for this class.

And for third class (30-40) 30 will be lower limit for this class.

Hope it may help you if any further problem you can ask me