Believe it or not, it’s vexed me for years.
A number like 1.5 could really round off to either 1 or 2. I remember in grade school, we were taught that it rounds off to 2. No explanation was ever given though (which is what really bothered me even back then).
I took an intro to chemistry class in a local community college (I guess I can tell you it was exactly 25 years ago now). And the teacher gave us this rather complicated odd/even rule. I forget the exact details. But rounding it off was apparently contingent on whether the number was odd or even. Again, no explanation for it was given. Although I got the impression it was just the teacher’s pet theory.
So purely SCIENTIFICALLY speaking (note my emphasis on the word), what does ½ round off to? And please this time, give an explanation why too. Thank you.