Is there any way to find arithmetic mean “better” than sum()/N?

Question

Suppose we have N numbers(integers, floats, whatever you want) and want to find their arithmetic mean. Simplest method is to sum all values and divide by number of values:

Answer 1

If you use float you might avoid big integers:

def simple_mean(array[N]):
    sum = 0.0 # <---
    for i = 1 to N
       sum += array[i]
    return sum / N