that's because you have zeroes in all the future weeks. get rid of the zeroes for future weeks and then use
=AVERAGE(INDEX(C3:BC3,COUNT(C3:BC3)):INDEX(C3:BC3,COUNT(C3:BC3)-9))
that's because you have zeroes in all the future weeks. get rid of the zeroes for future weeks and then use
=AVERAGE(INDEX(C3:BC3,COUNT(C3:BC3)):INDEX(C3:BC3,COUNT(C3:BC3)-9))
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