Assume the months are in A1:A6 and the data is in B1:B6.
Jan 5
Feb 3
Mar 6
Apr 4
May 2
Jun 5
The formula for quarter 1 is
=AVERAGE(B1:B3)
The formula for quarter 2 is
=AVERAGE(B4:B6)
Quarters 3 and 4 follow the same logic.
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