Accurate vs PreciseHardQuestion 30175
Question
Four measurements of a 10 Ω resistor: 9.9, 10.1, 9.8, 10.2 Ω. The mean is 10.0 Ω. This set is:
- AAccurate but not preciseCorrect
- BPrecise but not accurate
- CBoth accurate and precise
- DNeither accurate nor precise
Correct answer
Accurate but not precise
Explanation
The mean (10.0 Ω) equals the true value — so the set is accurate. But the spread (max deviation 0.2 Ω) is large — so it is not very precise.