First slide

Accuracy; precision of instruments and errors in measurements

Question

The mass of a box measured by a grocer's balance is 2.3 kg. Two gold pieces of masses 20.15 g and 20.17 g are added to the box. The total mass of the box is

Moderate

A

2.30 kg
B

2.340 kg
C

2.34 kg
D

2.3 kg

Solution

Total mass $= (2.3 + 0.02015 + 0.02017) k g$
= 2.34032 kg, upto one decimal place
= 2.3 kg

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