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