Mean value
==========

Complete the following excercises:

Exercise 1
----------

.. interactive_code_block:: 
   :caption: Use a for loop to calculate the mean value of a list of numbers
   
   list_of_numbers = [12, 3.4, 567, 8/9]

   for number in list_of_numbers:
       #..........
       #..........

   mean = #..........
   
   print(mean)


Exercise 2
----------

.. interactive_code_block:: 
   :caption: Use the built-in functions 'sum()' and 'len()' to calculate the mean value of a list of numbers
   
   list_of_numbers = [12, 3.4, 567, 8/9]

   mean = #..........
   
   print(mean)


Exercise 3
----------

.. interactive_code_block:: 
   :caption: Create a function which calculates the mean value of a list of numbers
   
   list_of_numbers = [12, 3.4, 567, 8/9]

   def mean(data):
       result = #..........

       return result
   
   print(mean(list_of_numbers))

..
   Exercise 4
   ----------
   
   .. interactive_code_block:: 
      :caption: Use the standard library 'statistics' to alculate the mean value of a list of numbers
      
      import #..........
   
      list_of_numbers = [12, 3.4, 567, 8/9]
   
      mean = #..........
      
      print(mean(list_of_numbers))


..
   # Version 1
   sum_of_numbers = 0
   number_of_numbers = 0
   for i in list_of_numbers:
   	sum_of_numbers += i
   	number_of_numbers += 1

   print(sum_of_numbers / number_of_numbers)

   # Version 2
   print(sum(list_of_numbers) / len(list_of_numbers))

   # Version 2b
   def average(l_o_n):
   	return sum(l_o_n) / len(l_o_n)

   print(average(list_of_numbers))

   # Version 3
   import statistics

   print(statistics.mean(list_of_numbers))