A rod's true length is 50.0 cm. Which set of readings is precise but not accurate?

  1. 50.1, 49.9, 50.0, 50.1, 49.9 cm
  2. 52.1, 52.2, 52.1, 52.0, 52.1 cm
  3. 47.0, 53.5, 49.0, 51.8, 48.6 cm
  4. 50.0 cm once only
Answer

B) 52.1, 52.2, 52.1, 52.0, 52.1 cm

The readings agree closely (precise) but are all about 2 cm too large — a systematic error. SLO P-11-A-05 · Application

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