hello all
I have a long list valve in column A, then in B1, let's say it is 20, C1 is 30, so I would like to make D1 as average(A20:A30), and if I change B1 to 50 or C1 to 80, then D1 should be average(A50 to A80). I am very new to excel so please expert help.
thanks
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