all of the measurements will be exactly the same only two of the measurements will be exactly the same all but one of the measurements will be exactly the same most of the measurements will be close but not exactly the same
I gave my students this multiple choice question: Whenever scientists carefully measure any quantity many times, they expect that

Only one answer is correct among these 4 choices:
- all of the measurements will be exactly the same
- only two of the measurements will be exactly the same
- all but one of the measurements will be exactly the same
- most of the measurements will be close but not exactly the same

Could you tell me which one is correct?

most of the measurements will be close but not exactly the same