打印列锯齿状二维数组的平均值

Question

I am trying to find the averages of columns of a 2d jagged array I tried this but only the first two columns are correct the rest are the wrong averages I am not sure why. There is a maximum of 5 columns

 int max = arr[0].length;
        for (int l = 1; l < arr.length; l++){
            if (arr[l].length > max){
                max = arr[l].length;
            }
        }
        
        for (int i = 0; i < max; i++){
            double sum = 0.0;
            for (int j = 0; j < arr.length; j++){
                if (i < arr[j].length){
                    sum += arr[j][i];
                }
            }
         double avg = sum / arr.length;
        System.out.println("Average in col  " + (i + 1) + "is: " + avg);  

        }

Answer 1

divide by arr[j].length instead of arr.length