Model Paper 1 — Economics STD 11 Commerce — Question

To convert the inclusive series into exclusive series
Correction factor = 100-99 /2=0.5
This is added to the upper limit and subtracted from the lower limit of the class.
The exclusive class interval table of a given form is shown below

Inclusive Class Interval	Frequency (f)
0-99.5	2
99.5-199.5	4
199.5-299.5	5
299.5-399.5	6
399.5-499.5	3
499.5-599.5	5
Total	25

In this case, as the lower limit of first class is zero, hence 0.5 will not be subtracted from it.