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Answer by Paul Childs for Significant figures rules
Your textbook is incorrect, both in its categorisation of certain and uncertain digits (as you have noted) and in the value it assigns. The rule is $\pm$ half if no further information is given. I.e....
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My textbook says "Significant figures are the digits conveying meaningful information. It includes all certain and first uncertain digit. If you are given a no. like 11.2 (sf=3), then uncertainity of...
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