#include <cstdio>
 
int main() {
    int c;
    scanf("%d", &c);
 
    for (; c > 0; c--) {
        int n;
        double avg = 0;
        scanf("%d", &n);
 
        int score[n];
 
        for (int i = 0; i < n; i++) {
            scanf("%d", &score[i]);
            avg += score[i];
        }
 
        avg /= n;
 
        int overavg = 0;
        for (int i = 0; i < n; i++) {
            if (avg < score[i]) {
                overavg++;
            }
        }
 
        printf("%.3f\%\n", (double)overavg / n * 100);
    }
}

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3 70 90 80
3 70 90 81
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