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

[单选题]
A student measures a distance fouoaw;oe 2/8qndtq c+;gr times. The readings are 37.8 cm, 37.9 cm, p fg6-j4( ju tpkg6.jq38.1 cm, 38.2 cm. Whatfjp66-4jt ukg. gjp(q is 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 measurements is 38.0 cm. The extremes (37.8 cm)te5 blahpd2( and 38.2 cm) are both 0.2 cm away from tal tpbd) he52(he mean. So C is the correct answer.