» Calculating the Average of Every Nth Value
CATEGORY - Excel Formula and Function
VERSION - All Microsoft Excel Versions
Calculating the average of the values from every 4th line in a list.
Solution:
Use the AVERAGE, IF, MOD, and ROW functions in the following Array formula:
{=AVERAGE(IF((MOD(ROW($B$2:$B$10)-ROW($B$2)+1,C2))=0,$B$2:$B$10))}

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