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

[单选题]
A student measures a distance four times. The reqf v;,a:ah6ph adings are 37j no,7huczg d /7vu.mk17-sss.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best es 1o z,hcdnj 7msgu77-s .u/vkstimate 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 3xc9 kk8whs )eyle* .f38.2 cm) are b*skkc h.x y9el3e )wf8oth 0.2 cm away from the mean. So C is the correct answer.