#include <stdio.h>
#include <math.h>
int a[2000];
int main()
{
int t,n,i,j,sum,count,avg,ans;
scanf("%d",&t);
while(t--)
{
sum=0,count=0;
scanf("%d",&n);
for(i=0;i<n;i++)
{
scanf("%d",&a[i]);
}
for(i=0;i<n;i++)
{
sum+=a[i];
}
avg=sum/n;
for(i=0;i<n;i++)
{
if(a[i]>avg)
{
count++;
}
}
printf("%.3f%%\n",((float)count/(float)n)*100);
}
return 0;
}
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