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

[单选题]
A student measures a distance four times. The readings are 37.8 cm, 37.9 f lx6g, mab+4ymlc8pq08wob6cm9) +r gfh9y gbsc(ydn8, 38.1 cm, 38.2 cd9+g bhr()cy gysf8 9nm. What 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 measuremnf: czpbx2 nuy.kdxq;)yr5s7 (n8 i3g ents is 38.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from tus.);gp bx:(n 2r 3yiczyxfd8k7qnn 5 he mean. So C is the correct answer.