input: Write a python function to apply a series of transformations on a list of numbers.
  assert transform_list([-1, 4, -6])==[-1.0, 2.5, -3.5]
  assert transform_list([0, 2, -3])==[0.0, 1.25, -2.0]
  assert transform_list([5, -2, 3])==[3.0, -1.5, 2.0]
output: def transform_list(lst):
      return [x / 2 + 0.5 for x in lst]