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

using namespace std;

int main(void) {
	int C = 0;
	int N = 0;
	cin >> C;
	for(int i=0; i<C; i++) {
		
		cin >> N;
		
		double student[N] = {0, };
		
		int count = 0;
		double score = 0;
		int score_total=0;
		
		for(int j=0; j<N; j++) {
			cin >> student[j];
		}
		
		for(int j=0; j<N; j++) {
			score_total += (double)student[j];
		}
		score = (double)score_total/(double)N;
		
		for(int j=0; j<N; j++) {
			if(student[j] > score) {
				count++;
			}
		}
		score = ((double)count/(double)N)*(double)100;
		cout << fixed;
		cout << setprecision(3);
		cout << (double)round(score*1000)/(double)1000 << endl;
	}
	return 0;
}