#include <iostream>
#include <iomanip>
using namespace std;

int main()
{
	int n,i,c,k;
	double a[1000],sum,j;
	cin>>c;
	for(k=0;k<c;k++)
	{
		sum=0.0,j=0.0;
		cin>>n;
		for(i=0;i<n;i++)
		{	
			cin>>a[i];
			sum+=a[i];
		}
		sum=sum/n;
		for(i=0;i<n;i++)
			if(a[i]>sum)
				j++;
	
		cout.setf(ios::showpoint);
		cout << setprecision(5) << j*100/n << "%"<<endl;
	}
	return 0;
}

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