the precision of the least precise measuement
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The precision of a calculated answer is limited by the least precise measurements used in the calculation.
The precision of a calculated answer is limited by the least precise measurements used in the calculation.
Forget about "significant figures"; those are used to determine the precision when you multiply or divide. When adding numbers, the rule is that the result should be rounded according to the precision of the least accurate of the addents. In this case, to one decimal digit.
Precision
No. However repeated measurements can be averaged or otherwise be used to arrive at a more accurate result.