bash- find average of numbers in line

Question

I am trying to read a file line by line and find the average of the numbers in each line. I am getting the error: expr: non-numeric argument

I have narrowe

Answer 1

Some variations on the same trick of using the IFS variable.

#!/bin/bash

while read line; do
    set -- $line
    echo $(( ( $(IFS=+; echo "$*") ) / $# ))
done < rows

echo

while read -a line; do
    echo $(( ( $(IFS=+; echo "${line[*]}") ) / ${#line[*]} ))
done < rows

echo

saved_ifs="$IFS"
while read -a line; do
    IFS=+
    echo $(( ( ${line[*]} ) / ${#line[*]} ))
    IFS="$saved_ifs"
done < rows