What are uncertainties?
If a measurement or the result of a calculation is stated in the form X±Y, then Y is the uncertainty. It indicates the precision of the measurement. It means that the true answer probably lies in the range of X-Y to X+Y. It almost certainly lies somewhere within the range of X-3Y to X+3Y. If there are two independent estimates for the same quantity, U±V and X±Y, then the true value is likely to be within the overlap of the two ranges, or if there is no overlap, between the ranges.
If a measurement or the result of a calculation is stated in the form X±Y, then Y is the uncertainty. It indicates the precision of the measurement. It means that the true answer probably lies in the range of X-Y to X+Y. It almost certainly lies somewhere within the range of X-3Y to X+3Y. If there are two independent estimates for the same quantity, U±V and X±Y, then the true value is likely to be within the overlap of the two ranges, or if there is no overlap, between the ranges.
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