code: def mean_and_list(x):
      """Returns a tuple, the first element is the mean of x and the second is x itself.
  
      This function can be used as an aggregator in :func:`cross_validated`,
  
      >>> mean_and_list([1,2,3])
      (2.0, [1, 2, 3])
  
      """
      return (mean(x), x)
  
imports: import math
  import random
  import itertools
  import functools
  import operator
  import array
  import inspect
label_desc: Use image node_id 7 for calling a global function with example usage: mean_and_list(x) and returns: mean,  x