input: Write a function to find the difference between the maximum and minimum values in a list.
  assert diffMaxMin([1, 8, 4, 5, 9]) == 8
  assert diffMaxMin([-5, -1, -10, 0, 5]) == 15
  assert diffMaxMin([7, 7, 7, 7, 7]) == 0
  assert diffMaxMin([100, 50, 200, -50, 0]) == 250
output: def diffMaxMin(lst):
      return max(lst) - min(lst)