import java.util.*;
public class Main{
    public static void main(String args[]){
        double sum =0;
        double avg=0;
        double count = 0;
        Scanner scanner = new Scanner(System.in);
        int N = scanner.nextInt();
        int [][] score = new int[N][];
        for(int i = 0 ; i<N; i++){
            int K = scanner.nextInt();
            score[i] = new int[K];
            for(int j=0; j<K;j++){
                score[i][j]=scanner.nextInt();
            }
        }
        for(int i = 0 ; i<N; i++){
            sum = 0;
            avg = 0;
            count = 0;
            for(int j=0; j<score[i].length;j++){
                avg = (sum+=score[i][j])/score[i].length;
            }
            for(int j=0; j<score[i].length;j++){
                if(avg<score[i][j]){
                    count++;
                }
            }
            System.out.printf("%.3f %% \n",(double)((count*100)/(score[i].length)));
        }
    }
}

인텔리제이에서는 아주 깔끔하게 나오는데 백준에서는 자꾸 틀렸다고 하네요 ㅠㅠ