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

[单选题]
A student measures a distance f lqb7,bigg7a0 (oviz.our 9dzw-.v6d :jxqxpz,0ljhzlc3 m p4)ttimes. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is)vczd,t0 zp.:xl qzj l43h d p9-6jmxw the best estimate 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 measrf) cou 4kdl3w.0o ve vzkpf (py2v/.*urements is 38.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 c.fuov2ypck 3 lv 4)vrfow/d*e(0 .pzk m away from the mean. So C is the correct answer.