input: from typing import List
  
  def averageMatrix(matrix: List[List[int]]) -> float:
      """ Calculate the average of the elements in a 2-dimensional array.
      >>> averageMatrix([[3,2,6],[8,5,9],[4,7,1]])
      4.77
      """
      
      total_sum = 0
      total_elements = 0
      
      for row in matrix:
          for element in row:
              total_sum += element
              total_elements += 1
      
      return round(total_sum / total_elements, 2)
output:     total_sum = 0
      total_elements = 0
      
      for row in matrix:
          for element in row:
              total_sum += element
              total_elements += 1
      
      return round(total_sum / total_elements, 2)