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

[单选题]
A student measures a distance g,arkpe1kvas:+(is 8 ;fg yt; foult(-u/ r+ xrk/+ ivhk3gj;cz 7m/htev r times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of this measuh k 3iuvjk-t/(rvh7gm/++ cr e;xtl/z rement?

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. The extremes (37.8 moo k9)a siq :m:3/puvcm and 38.2 cm) are v mo3u ik:)psoa/q: 9mboth 0.2 cm away from the mean. So C is the correct answer.