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Mass weighted on an electronic scale that is sensitive to +/-0.3 mg is 1.2300 g. Significant figures?

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What are the correct number of significant figures in this measurement? 1,2,3,4 or 5?

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  1. 5

    sig figs includes the last that is known to vary

    1.2303 to 1.2297 varies in the 5th digit

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