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

[单选题]
A student measures a distance foy/st0az,i5 5 uwh-w kjur times. The readings l8 g6 vdw2 ,g0pmz pqdkf il78o9qco:*are 37.8 cm, 37.9 cm, 38.1 c7wgo6vlgq0* m:pfd op8ki 2lq c9,zd8m, 38.2 cm. 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 38ib4: ;shpblo hlv)p: ;zzn w29.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So Cph2;: )zio lb9 bw;h4v:lnspz is the correct answer.