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Average Last X Weeks Of Data, Based On Current Week

Hi,
I would appreciate some help with a problem i have on my spreadsheet.

I have a column with week numbers (N58:N109) and a column with the number of items used per week (O58:O109). The weeks are from week 1 to week 52. the useage column automatically updates daily (it is linked).
I also have todays weeknumber displayed in cell F1 (based on today's date).

Is it possible to get the average of the last 8 weeks, based on todays week number?

so for example this is week 37, i would want to see the average number of items per week from week 30 to the current week.

and next week it would display from week 31-38 and so forth.


I hope that is clear, thanks in advance for your help!

Shifei


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