Shell Programming and Scripting

#! /bin/ksh
echo "Calculate average"
UserDecision=y
while test $UserDecision = y
do
echo "Enter a number: " 
read Number1
echo "Enter a number: "
read Number2
echo "Do you want to enter another number? (Y/N)"
read UserDecision
case $UserDecision in
"y" ) echo "Enter a number: "
                 read $Number ;;

"n" )  Total=$((Number1 + Number2))
        Average=$($Total / 3" | bc) ;;      
echo "The average is $Average" ;;
esac
done

Total=0
Inputs=0
while true
do
   echo -n "Number or q :"
   read UserDecision
   case $UserDecision in
      [0-9]*) Total=`expr $Total + $UserDecision`; : $((Inputs++));;
      *) break;;
   esac
done

Average=`expr $Total / $Inputs`
echo $Inputs $Average