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If I have 1±0.04 + 1±0.04 what would the tolerance of that equal?

What if we change it for a - or * or /?

I read somewhere that you should square the tolerances, add them together and then square root them. Which doesn't make sense because if I have the highest possible of each and add those together it wouldn't be within range of that answer.

Aequitas
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  • What you "read somewhere" must be about adding normal-distributed random variables, whereas you're thinking about interval arithmetic. You need first to be clear on what the notation $1\pm 0.04$ means to you in your context; then you can ask which rules apply to that meaning. – hmakholm left over Monica Sep 11 '15 at 01:05
  • @HenningMakholm Thank you for your quick reply. I'm not sure quite sure I understand which rules will apply, so perhaps if I explain the application I'm using it for: I have a video at 25fps which means I can only jump forward one frame at a time which is 0.04 seconds so if I measure an event happening at x time I would need to say it's +-0.04 seconds right? Now I want to time how long the event goes for so I measure the end time as well y+-0.04 and subtract them. Which gives me y-x +- ??? – Aequitas Sep 11 '15 at 01:08

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