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@vgersh99: you need to divide by (ARGC-1)

@AriasFco: try this:

$ awk '{
avg[$1,$2]+=$3;
i[FNR]=$1 SUBSEP $2
}
END{
for(k in i) sorted_i[j++]=k+0;
n=asort(i,sorted_i);
...

not tested....
awk '{x[FNR]+=$3;next}END{for(i=1;i in x;i++) print x[i]/ARGC}' allMyFilesWildWildCard

awk 'NF>2' data.dat