# Isn't it should be equal and more than the lower bound but less than the upper bound?

For frequency distribution for numeric variable between 1 and 100 both inclusive, the split / interval is

(1, 21]

(21, 41]

(41, 61]

where the number is included in the interval if it is equal to or more than the lower bound but less than the upper bound

so if the number is 1 it will be in first interval and if the number is 21 then it will be in second interval, right?

Hi Nisrin,

I think also this is an error.

I would use this notation for the intervals:

[1, 21[ (21 not included in the first interval)

[21, 41[

[41, 61[

[61, 81[

[81, 101[

Hi Benjoun,

Seriously I have no information of open square bracket usage in frequency distribution.

Rule is open parenthesis (round bracket) before lower bound that is included and closing square bracket after the upper bound that is excluded.

Thanks