#include <iostream.h>
#include <stdio.h>
int c;
long n;
long a[1000];
int main()
 {
  cin>>c;
  while (c)
   {
    c--;
    cin>>n;
    int i;
    long sum=0;
    for (i=1;i<=n;i++)
     {
      cin>>a[i];
      sum+=a[i];
     }
    double xb=(double)sum/(double)n;
    long t=0;
    for (i=1;i<=n;i++)
     {
      if (a[i]>xb) t++;
     }
    xb=(double)t/(double)n*100;
    printf("%.3lf%c\n",xb,'%'); 
   }
  return 0;
 }
    

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