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Sure, no problem:
awk '
NR==1 # If it is the first line in the file it is the header, perform the default action, i.e. print the line { print $0 }
...

OK, try something like:
awk 'NR==1; NR>1{A[$2]+=$3; C[$2]++} END{for (i in A) print i,A[i]/C[i]}' OFMT='%.2f' file