Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold LeetCode solution in Java

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class Solution {
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  public int numOfSubarrays(int[] arr, int k, int threshold) {
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    int average = 0, count = 0, start = 0, sum = 0;
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    for (int i = 0; i < arr.length; i++) {
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      sum += arr[i];
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      if (i >= k - 1) {
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        average = sum / k;
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        if (average >= threshold) count++;
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        sum -= arr[start];
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        start++;
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      }
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    }
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    return count;
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  }
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}