how to calculate greater than and less than for my work book

Dear all

i have some data to arrange depth (no) wise and i used this (=COUNTIF(G2:G18,">=XXX")) formula but its showing to me wrong answer so if its possible without using pivot table pls help and also i attached here what what i did...

Note:

i am beginner for excel...

your data is in table so use

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attached sheet

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its my pleasure.