input: from typing import List
  
  
  def averageMatrix(matrix: List[List[int]]) -> float:
      """ Calculate the average of elements in a given 2-dimensional array.
      >>> averageMatrix([[3,2,6],[8,5,9],[4,7,1]])
      5.0
      >>> averageMatrix([[1,2],[3,4]])
      2.5
      """
output:     total = 0
      count = 0
      for row in matrix:
          for element in row:
              total += element
              count += 1
      return total / count