list = [15, 18, 2, 36, 12, 78, 5, 6, 9]
# for older versions of python
average_method_one = sum(list) / len(list)
# for python 2 convert len to a float to get float division
average_method_two = sum(list) / float(len(list))
# round answers using round() or ceil()
print(average_method_one)
print(average_method_two)