A teacher measures the volume of a leaf by placing it in a measuring cylinder of water.
They take the two measurements shown in the diagram.
The uncertainty of the scale is half of the smallest divisions shown on the scale.
What is the volume of the leaf, including the correct level of uncertainty?
1 )
20 ± 0.1 cm$^3$
2 )
20 ± 0.2 cm$^3$
20 ± 1 cm$^3$
4 )
20 ± 2 cm$^3$
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