Answer
See the explanation
Work Step by Step
a.
Sample measurement $=30.01$
The number of significant figures in this measurement is $4$.
The uncertainty is equivalent to $\pm 0.01$
The measurement could be $30.00$ or $30.02$
b.
Sample measurement $=11.02$
The number of significant figures in this measurement is $4$.
Uncertainty is equivalent to $\pm 0.01$
The measurement could be $11.01$ or $11.03$
c.
Sample measurement $=20.00$
In this measurement, there are $2$ significant numbers
Uncertainty is equivalent to $\pm 0.01$
The measurement could be $20.01$ or $19.99$
