https://www.acmicpc.net/problem/4344
import java.util.*;
class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int c = sc.nextInt();
for (int i = 0; i < c; i++) {
int n = sc.nextInt();
int arr[] = new int[n];
int sum = 0;
double count = 0;
for (int j = 0; j < n; j++) {
arr[j] = sc.nextInt();
sum += arr[j];
}
sum /= n;
for (int k = 0; k < n; k++) {
if (arr[k] > sum)
count++;
}
System.out.printf("%.3f%%\n", (count / n) * 100);
}
sc.close();
}
}