#include <iostream>
#include <string>
#include <cstdlib>
#include <cmath>

using namespace std;

int main(void) {
	int C = 0;
	int N = 0;
	cin >> C;
	for(int i=0; i<C; i++) {
		
		cin >> N;
		
		int student[N] = {0, };
		
		int count = 0;
		double score = 0, score_total=0;
		
		for(int i=0; i<N; i++) {
			cin >> student[i];
		}
		
		for(int i=0; i<N; i++) {
			score_total += student[i];
		}
		score = score_total/N;
		
		for(int i=0; i<N; i++) {
			if(student[i] > score) {
				count++;
			}
		}
		score = ((double)count/N)*100;
		cout.setf(ios::showpoint);
		cout.precision(5);
		cout << round(score*1000)/1000 << "%" << endl;
	}
	return 0;
}