#include <stdio.h>
#pragma warning(disable:4996)
 
int main() {
	int a, b, c;
	int score[1000];
	double sum = 0;
	int people = 0;
	double average = 0;
	scanf("%d", &a);
 
	for (int i = 0; i<a; i++) {
		scanf("%d", &c);
		for (int j = 0; j<c; j++) {
			scanf("%d", &score[j]);
			sum += score[j];
		}
		average = sum / (double)c;
		for (int j = 0; j<c; j++) {
			if (average < score[j]) people++;
		}
		printf("%.3lf%%", people / (double)c * 100);
 
		sum = 0;
		people = 0;
		average = 0;
	}
}

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NQo1IDUwIDUwIDcwIDgwIDEwMAo3IDEwMCA5NSA5MCA4MCA3MCA2MCA1MAozIDcwIDkwIDgwCjMgNzAgOTAgODEKOSAxMDAgOTkgOTggOTcgOTYgOTUgOTQgOTMgOTEK

5
5 50 50 70 80 100
7 100 95 90 80 70 60 50
3 70 90 80
3 70 90 81
9 100 99 98 97 96 95 94 93 91