#include<iostream>
using namespace std;
int main()
{
	int x;
	scanf("%d",&x);
	while(x--){
		int n,a[1000],i,j,count=0,t=0;
		scanf("%d",&n);
		for(i=0;i<n;i++){
			cin>>a[i];
			t+=a[i];
		}
		double all=t,count1;
		all/=n;
		for(j=0;j<n;j++)
		 	if(a[j]>all) count+=1;
			count1=count*100;
		 	printf("%.3lf%c\n",count1/n,'%');
	}
	return 0;
}