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

[单选题]
A student measures a distance four times. The readings az)hrt o8vv w18re 37.8 cm, 37.9 cm,i d.ikt7 fa)dm 58z;gm 38.1 cm, 38.2 cm;ii8 f d)a75tmdz .kgm. 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 (37.8 cm and 38.2 cma2pobsnq2: 2p zx a35s o,m-fw a/4tqm) are both 0.2 cm away from the mean. So C is the correct- s aoqq /sm:b4, 3zt22awxnfpoap25m answer.