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

[单选题]
A student measures a distance four times. The readings are 8i ci8te82 )kwznwg9b37 8 phr;gw,(lmjrai.ni cq.q13.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best erch.g;imlnp,(q . 1iqw83ajr stimate 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 extrphd;p rf,xi rz4 02j(xpewdu/ 2k ,b6uemes (37.8 cm and 38.2 cm) are both 0.2 cm awkwbxp,pxu024ih u/ , 2fdrj p(6z;rd eay from the mean. So C is the correct answer.