Average marks from list

Question

Sorry if I don\'t write good, it\'s my first post.

I have a list in one file with the name, id, marks etc of students (see below):

And I want to calculate th

Answer 1

awk 'NR>1{n=split($NF,a,",");for(i=1;i<=n;i++){s+=a[i]} ;print $1,s/n;s=0}' input
athos 3.875
porthos 3.5
aramis 3

For all the lines except header(NR>1 will filter out header) , pick up the last column and split into smaller numbers by comma. Using for loop sum the value of all the marks and then divid by the total subject number.