What is 58.629 to one significant figure?

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

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4. Intel Inside Expand Collapse 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. macjram Expand Collapse macrumors 6502a

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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

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#6
7. Peace Expand Collapse macrumors P6

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8. puma1552 Expand Collapse 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. Rodimus Prime Expand Collapse macrumors G4

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

10. Eraserhead Expand Collapse macrumors G4

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

11. AlphaDogg Expand Collapse macrumors 68040

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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. Rodimus Prime Expand Collapse macrumors G4

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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. RITZFit Expand Collapse macrumors 65816

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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. Signal-11 Expand Collapse macrumors 65816

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15. AustinIllini Expand Collapse macrumors demi-god

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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)

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50

16. Signal-11 Expand Collapse macrumors 65816

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#16
What about 55? What does 55 round to?

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18. Signal-11 Expand Collapse macrumors 65816

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19. dukebound85 Expand Collapse macrumors P6

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#19
Obvious you are not an engineer lol

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To me 54.9999999.... Rounds to 60 at 1 sig fig as 54.999999... ..is exactly the same as 55 mathematically

20. AustinIllini Expand Collapse macrumors demi-god

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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. puma1552 Expand Collapse 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. AustinIllini Expand Collapse macrumors demi-god

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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

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

23. dukebound85 Expand Collapse macrumors P6

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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. AustinIllini Expand Collapse macrumors demi-god

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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".

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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. Signal-11 Expand Collapse macrumors 65816

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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.