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

[单选题]
A student measures a distance fourdd jy;fn: .f1c z3u(oh 48mfzo times. The readings are 37.8 cm, 37.9 cm, g)r2xsmh8. ozem 9 tmsasd. -,38.1 cm, 38.2 cm. rx,oemags m ssdh-..9z )8tm2 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 measurements is 38.0 cm. The extremes (37 i8 76sv1pbtroyz +h cbewv5;+.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C is th6;zyh b bv+v5wp s1ec or8i7t+e correct answer.