let result_posative = 0;
let result_nagative = 0;
let result_zero = 0;
for(let i=0;i<arr.length;i++){
   if(arr[i] > 0) {
   result_posative++;
   } else if(arr[i] < 0) {
   result_nagative++;
   } else {
   result_zero++;
   }
}
console.log(result_posative / arr.length);
console.log(result_nagative / arr.length);
console.log(result_zero / arr.length);