Electrons exist as a probability cloud defined by their wave function. If an electron was flying through empty space (e.g. as beta radiation), would it (a.) follow a fixed straight path (which we could confirm every time we measured it), or would it (b.) keep jittering around in a fuzzy probability cloud, slightly varying from the straight path every time we measure it?
(b.) seems impossible because newton's first law: without any external force, how can the electron jitter around? But (a.) seems wrong too, because an electron shouldn't stay "fixed", it should occupy some fuzzy probabilistic cloud, right?