It depends on the measuring instrument that you use (including its calibration), how careful you are, how many measurements you take, whether or not you have allowed for external factors that could affect your measurement.
What determines how precise a measurement is
It is precise if it is repeatable.
Is as exact as possible
tenth of a gram
The precise measurement is 5.7 mm for the first value and 3.6 m for the second value.
No. An answer is only as precise as the least precise measurement from which it was calculated.
What determines how precise a measurement is
It is precise if it is repeatable.
You can make a very precise measurement with a poorly calibrated device.
No. Accurate relates to how close the actual measurement the instrument measures. Precise relates to how much detail the instrument gives when measuring. They are independent to each other: An measurement can be precise and accurate (eg the value of π is 3.141592654) An measurement can be precise and inaccurate (eg the value of π is 1.733677432) An measurement can be less precise and accurate (eg the value of π is 3.14) An measurement can be less precise and inaccurate (eg the value of π is 1.73).
measuring tape
19.2cm is more precise
An automatically measurement has a higher precision than a manually measurement.
tenth of a gram
Is as exact as possible
A measurement in pints is more precise.
They are equally precise.