SMALL(n1, n2, ..., k)
SMALL @k- .
, #NUM!. @k <= 0 @k , #NUM!.
Excel.
, A1, A2, ..., A5 11.4, 17.3, 21.3, 25.9 40.1.
SMALL(A1:A5,2) 17.3.
SMALL(A1:A5,4) 25.9.
PERCENTILE, PERCENTRANK, QUARTILE, LARGE.