An experiment to calibrate the volume of a pipette was conducted using water (instead of mercury for safety reasons) and a balance that is precise to 4 decimal places. After 10 weighings, the recorded mass was 4.984 2 ± 0.000 05 g. The density of water on that day was 0.998 9 ± 0.000 05 g mL−1

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a. What is the volume dispensed by the pipette?

b. What is the relative uncertainty of that measurement?