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

[单选题]
A student measures a dissyft-/7amjc. js sv2:tance four times. The readings ac7* wnjzq-cuz4u2g/ v(ck4 bgre 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estinz(uq w c442zcjb7v/k u-*cggmate 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 cm) are c3,ay*t8 nvymboaym8t3 vcn,* yth 0.2 cm away from the mean. So C is the correct answer.