Error in loops, new to Python

[smbx33]

For question one, I feel most of those steps are unnecessary as you would get the same answer from some thing like:

list_ = [4.5,6,120.5,9,1,2]
s = sum(list_)
print((s/len(list_)))

I tried to convert the already existing code into a functioning one. Although I didn't know that tiny little tidbit about modifying list while iterating over it :)