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Significant Figures
That depends on your goals AND on your measuring capabilities.
The answer depends on whether you are measuring the drops from a slow drip or the number of drops of water in an ocean!
20.2 has three significant figures.
5 significant figures.
Estimated
estimated
The degree of accuracy of the measuring instrument.
Significant Figures
They tell you what level of precision you can expect from measurements that are made using that instrument.
That depends on your goals AND on your measuring capabilities.
The greater the number of significant figures, the greater the precision. Each significant figure increases the precision by a factor of ten. For example pi = 3.14 is accurate to 3 significant figures, while pi = 3.14159 with 6 significant figures is a more accurate representation.
No, the units are independent of the accuracy. If you are measuring volume, how accurate the measurement is (or isn't) will not affect what you are measuring - it will always be volume.
The answer depends on whether you are measuring the drops from a slow drip or the number of drops of water in an ocean!
4 significant figures.
There are 3 significant figures in 94.2.
There are 4 significant figures in 0.0032. Seems to be only 2 significant figures in this number.