What is 58.629 to one significant figure?

Discussion in 'Community Discussion' started by Intel Inside, Nov 4, 2012.

  1. macrumors 6502

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    #1
    50 or 60?
     
  2. Moderator emeritus

    r.j.s

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    #2
    It would be 60.
     
  3. Moderator

    stridemat

    Staff Member

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    #3
    I would say 60.
     
  4. thread starter macrumors 6502

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    #4
    Thanks guys, i think it's 60 too. trying to prove to someone that it is really 60!
     
  5. macrumors 6502a

    macjram

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    #5
    I would say that from:

    50-54: 1 sig fig would be 50
    55-60: 1 sig fig would be 60
     
  6. macrumors 603

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    #6
  7. macrumors P6

    Peace

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  8. macrumors 68040

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    #8
    sig figs are stupid as hell and serve little purpose in the real world

    that said, its 60 for your professor
     
  9. macrumors G4

    Rodimus Prime

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    #9
    general rule 1-4 round down. 6-9 round up. 5 rounds to nearest even number.
     
  10. macrumors G4

    Eraserhead

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    #10
    In computing, yes, but in maths I believe you round away from zero.
     
  11. macrumors 68040

    AlphaDogg

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    #11
    60 is one sig fig.
    60. is 2 sig figs.
    060 is 2 sig figs (not sure on this one)
     
  12. macrumors G4

    Rodimus Prime

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    #12
    no they have a huge purpose in the real world. Big time in engineering.

    Reason why is numbers past the point of what significant figures you have worthless and can not be trusted in any way shape or form. With out significant figures you end up with a fairly large amount of rounding error that can and will build up very quickly and really throw off your answer.
     
  13. macrumors 65816

    RITZFit

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    #13
    Yup, especially when you start talking about machining precision and tolerancing, both of which will be driven by cost, application, and tooling capabilities.
     
  14. macrumors 65816

    Signal-11

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    #14
    What about 54.999... to one sig fig?
     
  15. macrumors demi-god

    AustinIllini

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    #15
    60 is one sig fig.
    60. is two sig figs.
    060 is one sig fig (leading zeros are never significant)

    ----------

    50
     
  16. macrumors 65816

    Signal-11

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    #16
    What about 55? What does 55 round to?
     
  17. macrumors demi-god

    AustinIllini

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    #17
  18. macrumors 65816

    Signal-11

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    #18
  19. macrumors P6

    dukebound85

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    #19
    Obvious you are not an engineer lol

    ----------

    To me 54.9999999.... Rounds to 60 at 1 sig fig as 54.999999... ..is exactly the same as 55 mathematically
     
  20. macrumors demi-god

    AustinIllini

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    #20
    A vast majority of standards maintain that 54.999 rounds down to 50. It's when a number is EXACTLY half way when things get hazy.

    4.999 is like standing on your 49 yard line of a football field. Ultimately, however you slice it, you are closer to your own end zone. No matter what happens, 4.999 is closer to 0 than to 10.
     
  21. macrumors 68040

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    #21



    Actually I am; I have not ever once seen anyone give two sharts about sig figs in industry.

    Not once. Not once have I ever seen someone take 54 of something and decide it's better/more accurate to round that off to 50.
     
  22. macrumors demi-god

    AustinIllini

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    #22
    Okay, I misunderstood the original intent, but 54.9999999... is improper and should be written as 55, which rounds to 60 in almost every standard. I thought you literally meant 54.999

    ----------

    You don't work in Pharmaceuticals. That being said, usually we don't argue 1 sig fig. it's usually at least three.
     
  23. macrumors P6

    dukebound85

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    #23
    Granted usually more precision is needed than 1 sig fig in practice

    BUT.....

    sorry if I doubt your claim that sig figs aren't important for engineering. I speak as an engineer myself and without sig figs, there would be big issues
     
  24. macrumors demi-god

    AustinIllini

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    #24
    This discussion is an extreme simplification, and usually computers make a great deal of rounding decision, but I wasn't honestly thinking "what do we need to round to determine the stroke time of a control valve".

    ----------

    Exactly. Sig figs provide information regarding the accuracy of measurements. They penalize the user's application of inaccurate equipment. If I want to measure the distance my car travels in 5 minutes, it doesn't matter that I can measure time to 5 decimal places if my distance measurement only carries one significant figure.
     
  25. macrumors 65816

    Signal-11

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    #25
    The three elipses following the three nines is another way of stating an infinitely repeating series of 9s.

    As dukebound stated, 54.999... rounds to 60.

    Just a bit of math trolling. ;)
     

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