Andy C. answered • 08/16/17

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7.379 x 10^(-4) is measured , hence prone to error, either human error or via the measuring device.

In this case, the scale.

100 cm = 1 m is written in stone and is unquestionable.

The density of gold is 19.3 g/cm^3 and could be an approximation.

The approximation is good to at least one digit.