Precision vs. Accuracy in Measurements

Steps:

• Identify true mass as 75 kg; recorded readings are 80.2 kg, 80.2 kg, 80.1 kg.
• Check precision: readings vary by at most 0.1 kg, indicating high repeatability to 0.1 kg.
• Check accuracy: average reading is 80.17 kg, with systematic error of ~5.17 kg from true value.
• Compare to options: precision matches 0.1 kg claim; accuracy fails even to 1 kg due to large bias.

Why D is correct:

• Precision measures agreement (readings consistent within 0.1 kg); accuracy measures closeness to true value (error exceeds 1 kg, per standard definitions).

Why the others are wrong:

• A: Wrong; readings are precise to 0.1 kg.
• B: Wrong; accuracy is poor, not to 0.1 kg.
• C: Wrong; accuracy fails to 0.1 kg due to 5 kg error.

Final answer: D