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]])
      5.222222222222222
      """
      sum_elements = 0
      total_elements = 0
      for row in matrix:
          for element in row:
              sum_elements += element
              total_elements += 1
  
      return sum_elements / total_elements
output:     sum_elements = 0
      total_elements = 0
      for row in matrix:
          for element in row:
              sum_elements += element
              total_elements += 1
  
      return sum_elements / total_elements