It doesn't even need to be that close to 2.5 2 1/3 pretty clearly rounds to two. And two lots of that clearly rounds to five.
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Math automatically becomes "messy" when applied to the real physical world That act of application is messy, it's subjective, it inevitably introduces error and bias Significant digits, error bars, ceci n'est pas un cinq
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This may be a trivial truth but it's a deep and important one, precisely because it's one that people VERY FREQUENTLY forget (the laughable aphorism "Numbers don't lie")
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A joke from academia: A man was in a hot air balloon when a fog rolled in and he couldn't see the ground. He yelled down "Where am I?" And from the ground he heard someone yell back "You're in a hot air balloon.". /1
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This he knew he was at the local University math department because he'd been given an answer that was technically correct but had zero practical use.
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