In [ ]:

    

#Write a function that takes in a list of numbers and outputs the mean of the numbers 
#using the formula for mean. 
#Do this without any built-in functions like sum(), len(), and, of course, mean()


    

In [58]:

    

def mean(a_list):
    list_sum = 0
    list_count = 0
    for i in a_list:
        list_sum += i
        list_count += 1
    return list_sum / list_count


    

In [60]:

    

list1 = [15, 34, 8, 19, 5]

mean(list1)


    

    
Out[60]:





16.2

In [62]:

    

import numpy #just to check
numpy.mean(list1)


    

    
Out[62]:





16.199999999999999