As part of the calibration of a new laboratory balance,the mass of a 0.200 g mass standard is determined with the following results:

A) The balance is $\underline{\text{ both }}$ accurate and precise.
B) The balance is accurate but imprecise.
C) The balance is precise but inaccurate.
D) The balance is $\underline{\text{ both }}$ inaccurate and imprecise.

Question

As part of the calibration of a new laboratory balance,the mass of a 0.200 g mass standard is determined with the following results:

A) The balance is $\underline{\text{ both }}$ accurate and precise. 
B) The balance is accurate but imprecise. 
C) The balance is precise but inaccurate. 
D) The balance is $\underline{\text{ both }}$ inaccurate and imprecise.

Quizplus · Accepted Answer

The average mass determined is very close to the true mass of the 0.200 g standard, indicating that the balance is accurate. However, the range of values obtained in the three trials is relatively large (0.023 g), indicating that the balance is imprecise. Therefore, the best choice is B, which indicates that the balance is accurate but imprecise.

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