#!/usr/bin/env bash

test $# -eq 6 || { echo must have all six scores; exit 1; }
echo "($1*1 + $2*2 + $3*3 + $4*4 + $5*5 + $6*6) / ($1+$2+$3+$4+$5+$6)" | bc -l | awk '{printf "%.04f\n", $1 }'
