input: Write a python function to compute the average of a list of numbers.
  assert compute_average([10, 20, 45, 60]) == 31.25
  assert compute_average([1, 2, 3, 4, 5]) == 3.0
  assert compute_average([100, 200, 300]) == 200.0
output: def compute_average(numbers):
      return sum(numbers) / len(numbers)