#include<stdio.h>
int main()
{
    int kase,n,i;
    float avg, res,sum,cnt;
    float arr[1005];
    scanf("%d", &kase);
    char c = '%';
    while(kase--)
    {
        avg = 0;
        sum = 0;
        cnt = 0;
        scanf("%d", &n);
        for(i=0; i<n; i++) scanf("%f", &arr[i]);
        for(i=0; i<n; i++) sum = sum + arr[i];
        avg = (sum / n);
        for(i=0; i<n; i++) if(arr[i]>avg) cnt++;
        res = ((cnt/n)*100);
        printf("%.3f%c\n", res, c);
    }
    return 0;
}