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At 21:00 24/04/2015 +0100, Pete Nikolic wrote:
I need to be able to select the last 3 in a series of cells that change on a weekly basis so in
week 1: there would be 1 cell - no action
week 2: 2 cells - no action
week 3: 3 cells - sum three cells
week 4: 4 cells - sum last three
week 5: 5 cells - sum last three
and so it goes on for 8 weeks always just summing the last 3 cells in the series then divide by 3 subtract 30 = result ..

I'm guessing that you want separate results for each week, not just a single result - so that in week 5, for example, you would have three results, not one. Let's imagine your data is in column A, starting in A1. In B3, insert:
and fill down the column.

If you want to suppress the display in B cells for which there is not yet an A-cell vale, try something like:

I trust this helps.

Brian Barker

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