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

[单选题]
A student measures a distance fok67 j2oua(ei fur times. The readings are 37.8 cm, 37.9 ce uk1sr:z:*z8az/hk /q x ob2im, 38.1 cm, 38.2 cm. What is the best estimate of this mea/a* 8o2uzr:1qxz kzs ibk he:/surement?

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. T)e69 yi umjsv0he extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C is tesui09m)6 vy jhe correct answer.