student@uso:~/uso-lab/lectures/auto/grades$ tail -n +2 2016-2017.csv | cut -d',' -f3 | grep -v '^$' | paste -s -d'+' | bc
3657.0
student@uso:~/uso-lab/lectures/auto/grades$ sum=$(tail -n +2 2016-2017.csv | cut -d',' -f3 | grep -v '^$' | paste -s -d'+' | bc)
student@uso:~/uso-lab/lectures/auto/grades$ count=$(tail -n +2 2016-2017.csv | wc -l)
student@uso:~/uso-lab/lectures/auto/grades$ echo "scale=2; $sum/$count"
scale=2; 3657.0/493
student@uso:~/uso-lab/lectures/auto/grades$ echo "scale=2; $sum/$count" | bc
7.41