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That script always prints the last line (and in some awks it prints an empty line). Try:
awk '{if ($4 > max) {max=$4; maxline=$0}} END {print maxline}' infile
This works is the clusters are in...

#!/usr/bin/perl -w
...

my bad - sorry:

awk 'NF {s=0;for(i=1;i<=NF;i++) s+=$i;printf("%.1f\n", s/NF)}' myFile