input: Write a python function to find the minimum, maximum, and mean of a list of numbers.
  assert min_list([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) == 1
  assert max_list([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) == 10
  assert mean_list([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) == 5.5
output: def min_list(numbers):
      return min(numbers)
  
  def max_list(numbers):
      return max(numbers)
  
  def mean_list(numbers):
      return sum(numbers) / len(numbers)