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

[单选题]
A student measures a distance four times. The mb a y zx8*(u,jtwgy91m. u/rkreadings are 37.8 cm, 3j*::9q pvej.w(c ry0hlc11 wsc ,aiai7.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of this measuremeni c9hw swi,j ca*pevj(y:lrqa: 1 .0c1t?

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 extre pc-b k6h r h86t+yyy-(fe6ytbmes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C is the correcthryy -b8+e t6 by-kc(6f6 thyp answer.