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

[单选题]
A student measures a -,qm6momb2 hf1e*ha ii r3 on/sxd59qdistance four times. The readings are 37.fvd,0 nh ue2.j8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimateh .e0,v2 njufd 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 etf/i/vnx sv3j *3uzd *xtremes (37.8 cm and 38.2 cm) are both 0.3j/iu zv*3v ntsxf*d/2 cm away from the mean. So C is the correct answer.