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

[单选题]
A student measures a dist :xe zs8njs4s35 hhsc0ance four:(wd+2ih2 c6m hp aqxj,w*ruh times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cmqwur 2hc,d+iphw2:jma 6 * hx(. 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 extreme d o .u/ms+4euooug5s:s (37.8 cm and 38.2 cm) are bs +uo o.og/ s:dueu45moth 0.2 cm away from the mean. So C is the correct answer.