read n
result=0
for((i=0;i<$n;i++))
do
    read num
    result=$(echo " $result + $num " |bc)
done
r=$(echo "$result / $n" | bc -l)
printf "%0.3f" "$r"

#!/bin/bash

read n
str="0"

# for i in {0..$n};
for ((i=0; i<$n; ++i));
do
    read a
    str="$str+$a"
done
echo "($str)/$n" | bc -l | xargs printf "%.3f"

read N

sum=0

for((i=1; i<=N; i++))
do
    read X
    sum=$((sum+X))
done

expression="$sum / $N"

result=$(printf %.3f $(echo $expression|bc -l))

echo $result

read count_of_number
if [[ "$count_of_number" -ge 1 && "$count_of_number" -le 500 ]]; then
    list_of_integers=0
    for number in $(seq 1 $count_of_number)
        do
            read numbers
            if [[ "$numbers" -ge -10000 && "$numbers" -le 10000 ]]; then
            list_of_integers=$(($numbers + $list_of_integers))
            else
                echo "the number: $numbers is out of the range (-10000 <= x <= 10000)"
                exit 1
            fi
        done
    average=$(echo "scale=4; $list_of_integers / $count_of_number" | bc -l | xargs printf "%.3f")
    echo $average
else
    echo "the count of number is out of the range (1 <= N <= 500)"
fi

read input
x=0
i=0
while [[ $i -lt $input ]]
do
read num
x=$((x+num))
i=$((i+1))
done
echo $(printf %.3f $(echo "scale=4;$x/$input"|bc -l))