input: 
  from typing import List
  
  def calculate_average(numbers: List[int]) -> float:
      """ Calculate the average of a list of positive integers.
      >>> calculate_average([1, 5, 6, 7, 8])
      5.4
      """
      total = sum(numbers)
      avg = total / len(numbers)
      return avg
  
output:     total = sum(numbers)
      avg = total / len(numbers)
      return avg