That would depend on personal preference. Somewhere around the 70-80 mark most likely.
You’re assuming humans have no preference for it being hot or cold. That’s the only way 50% would make more sense. But most people prefer it warm
My assumption was that a temperature scale for the human experience would place the ideal temperature around the middle, and not towards too hot. Would it improve such a scale if the 0 F was closer where 20 or 30 is currently, so that 70-80 is more centered? Is 0 F the perfect point for where it’s unacceptably cold for a human, or could it have been shifted up or down the scale?