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Poll: round 2.0469 to two significant figures
  2.0
  2.1


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Author round 2.0469 to two significant figures
Haimsey
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Registered: 8th May 05
Location: Nottingham Drives: Corsa B
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17th Nov 05 at 18:22   View Garage View User's Profile U2U Member Reply With Quote
quote:
Originally posted by whitter45
2.05 you clot


2.049999999 reccuring dickwad

Marcy Marc

White Sport Progress Thread
ed
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Registered: 10th Sep 03
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17th Nov 05 at 22:30   View User's Profile U2U Member Reply With Quote
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Ian
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Registered: 28th Aug 99
Location: Liverpool
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17th Nov 05 at 23:27   View Garage View User's Profile U2U Member Reply With Quote
quote:
Originally posted by gianluigi
you are seriously not saying 2.0 and 2 are not the same expression?
Indeed I am.

2 to 1SF equates to an original number of 2 +/- 0.5
2.0 to 2SF equates to an original number of 2 +/- 0.05

As you can see, the variance is smaller in the second number.

Consider 2.09, which rounds to at 2SF to 2.1, but at 1SF to 2.

Wikipedia has this -

Common method of rounding
This method is commonly used, for example in accounting.

Decide which is the last digit to keep.
Increase it by 1 if the next digit is 5 or more (this is called rounding up)
Leave it the same if the next digit is less than 5 (this is called rounding down)
Example: 3.046 rounded to hundredths is 3.05 (because the next digit (6) is 5 or more)

Notice they don't get 3.05 and make that in to 3.1, and then make 3.1 in to 3.0. That would be wrong.

http://en.wikipedia.org/wiki/Rounding
broster
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Registered: 6th Dec 02
Location: Drives: E39
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18th Nov 05 at 08:57   View Garage View User's Profile U2U Member Reply With Quote
lol at all this, people seem to get confused between decimal and significant figures. nicely cleared up ian!

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