Count frequency of numbers?

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Javascript

I have created 2 functions, with the RepeatNtimes() supposed to display the DOM elements results and call the CountIndex() inside. While the CountIndex() has to access the input.value and generate random number by the "input" times. If I consoled the code below it can't undefined the element arr[j] and also skipped the loop in the CountIndex(). It's nothing change when I switch the string literal from the RepeatNtimes() to the CountIndex()

<script>
        let arr = [0,0,0,0,0,0,0,0,0,0];
        //input number DOM object
        let input = document.querySelector("#input_number");
        let num = Number(input.value); 
        function RepeatNtimes() 
         {
           for(let i =0; i<=num;i++)
           {
               // Clear array
               arr = [];
               CountIndex();
               
           }
         }
         function CountIndex()
         {
          for(let j = 0;j<=num;j++)
          {
          let rand = Math.floor(Math.random()*10);
          arr[rand]++;
    document.querySelector("#re").innerHTML = `${j} appearance is: ${arr[j]} <br>`;
             }
         }
     
    </script>

What I have tried:

I use that string literals instead of declare 10 DOM object from 0-9