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)
l =[15,18,2,36,12,78,5,6,9]# By using the built-in statistics libraryimport statistics
statistics.mean(l)# 20.11111111111111# By defining a custom functiondefaverage(my_list):returnsum(my_list)/len(my_list)
average(l)# 20.11111111111111