input: def averageMatrix(matrix):
   """
   Calculate the average of the elements in a 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)