Kognity IB Physics A.0 Measurements & Uncertainty (id: 87ba97ed9)

[单选题]
A student measures a distance four times. The readings are 37.8 cmq ;u-/iiab 7ce djiy6ad)pk mr)xb4- ., 37.9 c-zpqn ,ud7 .dlm, 38.1 cm, 38.2 cm. What u7n-pldqd, z. is the best estimate of this measurement?

A. $37.8 \pm 0.2 \; cm$
B. $37.8 \pm 0.4 \; cm$
C. $38.0 \pm 0.2 \; cm$
D. $38.2 \pm 0.4 \; cm$


参考答案:  C


本题详细解析:
The mean of the measurements is 38.0 cm. Tvenm1hiel ) n2otbe e*;5z v86he extremes (37.8 cm and 38.2 cm) are both 0.2 cm awam b6et zne5 v1hle)8iv* e;2ony from the mean. So C is the correct answer.