To calculate the average of n biggest numbers from a list enter this formula with Ctrl + Shift + Enter:
=AVERAGE(IF(RANK(yourrange,yourrange)<=n,yourrange,”"))
To calculate the average of n smallest numbers from a list enter this formula with Ctrl + Shift + Enter:
=AVERAGE(IF(RANK(yourrange,yourrange)>COUNT(yourrange)-n,yourrange,”"))
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