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

[单选题]
A student measures a distance fourk:qrhoa v- ecd8wg+zmf u7+22 times. The readings are 37v 8 4gsayfhbm(0b z8-9uy8z ueey5/k f.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of this measurement?fh(mvzf -ybky4ey50g az8/8ueu 9 s8b

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.izv;5v rdsrz7:1j,7irssv5 mp3 pmb : The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C is the corrz:i7r1rm;jrss :v7sv5b v5 zd mp3ip,ect answer.