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

[单选题]
A student measures a -ldi psf yjk135+(riud0ci7nd;f( n4ks45clp7zxq ;upr l(s eistance four times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is tc5 0udzfnnxil;sl k4(q77(psr ; 4pec he 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 and 38.+g jqy;2 nh*)*z xqsv1he r)hs2 cm) are both 0.2 cm away fr*x+hv;s*qn geh)yrhjq sz2) 1om the mean. So C is the correct answer.