POJ2350

/*
Easy
*/
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<algorithm>
#include<iostream>
#include<queue>
#include<map>
#include<stack>
#include<set>
#include<math.h>
using namespace std;
typedef long long int64;
//typedef __int64 int64;
typedef pair<int64,int64> PII;
#define MP(a,b) make_pair((a),(b)) 
const int maxn = 1005;
const int inf = 0x7fffffff;
const double pi=acos(-1.0);
const double eps = 1e-8;

double a[ maxn ];

int main(){
	int T;
	scanf("%d",&T);
	while( T-- ){
		int n;
		scanf("%d",&n);
		double sum = 0;
		for( int i=1;i<=n;i++ ){
			scanf("%lf",&a[i]);
			sum += a[i];
		}
		double avi = sum/n;
		int cnt = 0;
		for( int i=1;i<=n;i++ ){
			if( a[i]>avi )
				cnt++;
		}
		cnt *= 100;
		printf("%.3lf%%\n",1.0*cnt/(1.0*n));
	}
	return 0;
}