EdgeOS Load-Balance Response Time Script

#!/bin/bash
ping -O yahoo.com -c 3 2>/dev/null 1>/tmp/testout.log
sed -i '1d' /tmp/testout.log
sed -i '4,7d' /tmp/testout.log
sed -i 's|^.*time=||' /tmp/testout.log
sed -i 's|\ ms||' /tmp/testout.log
sed -i 's|\..*||' /tmp/testout.log
linetotal=0
while read line
do
linetotal=$(($linetotal + 1))
done < /tmp/testout.log
SUM=0
while read line
do
SUM=$(($SUM + $line))
done < /tmp/testout.log
final=$(($SUM / $linetotal))
if (("$final" > "900")); then
exit 1
else
exit 0
fi