4344 평균은 넘겠지

const fs = require('fs');
const [C, ...input] = fs.readFileSync('dev/stdin').toString().trim().split('\n');
for (let i = 0; i < C; i++) {
  let sum = 0;
  let count = 0;
  score = input[i].split(' ').map(Number);
  for (let j = 1; j <= score[0]; j++) {
    sum += score[j];
  }
  let avg = sum / score[0];
  for (let k = 1; k <= score[0]; k++) {
    if (score[k] > avg) count++;
  }
  console.log(((count / score[0]) * 100).toFixed(3) + '%');
}