Average

awk '{sum+=$1};END{print sum/NR}' result

Use Tab as field delimiter

cut -f 1 file
awk -F$'\t' '{print $1} file

Note: cut use TAB for its field delimiter

Uncompress all the archives in one

find . -name '*.zip' -execdir unzip '{}' ';'
find . -name '*.tar.gz' -execdir tar -xvf '{}' ';'