[Python] Why does np.sum on z-scores of [10, 20, 3, 40, 50] return -8.89 instead of 0?

enter image description here

np.sum function is not returning expected output.

It should be 0 but it return -8.89 something.

The array is actually z-scores of [10,20,3,40,50]

Can someone figure out that what's wrong in this standardization, I'm trying to do it with numpy.



Continue reading...