function plusMinus(arr) {
  const len = arr.length;
  let plus = 0;
  let minus = 0;
  let zero = 0;
  for (let value of arr) {
    if (value > 0) plus++;
    else if (value < 0) minus++;
    else zero++;
  }

  console.log(Number(plus / len).toFixed(6));
  console.log(Number(minus / len).toFixed(6));
  console.log(Number(zero / len).toFixed(6));
}