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Old 09-16-2017, 10:36 PM
xor xor is offline Windows 10 Office 2016
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Join Date: Oct 2015
Posts: 1,100
xor is a name known to allxor is a name known to allxor is a name known to allxor is a name known to allxor is a name known to allxor is a name known to all
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I would use (in B2 and copy down)

=IF(ROW(2:2)-$C$2<0;"";AVERAGE(OFFSET($A$2;ROWS($1:1);;-$C$2)))

on condition you use semicolon as argument separator.
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