input: Write a function to add a given integer mark to each value in a list of marks. The function should return a new list with the updated values.
  def add_marks(marks, mark):
   return [m + mark for m in marks]
  assert add_marks([87, 56, 99, 54], 4) == [91, 60, 103, 58]
  assert add_marks([75, 80, 90], 2) == [77, 82, 92]
  assert add_marks([100, 100, 100], 0) == [100, 100, 100]
  assert add_marks([], 5) == []
  assert add_marks([10, 20, 30], -5) == [5, 15, 25]
output: def add_marks(marks, mark):
   return [m + mark for m in marks]