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

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本题目来源于试卷: Kognity IB Physics A.0 Measurements & Uncertainty，类别为 IBDP Physics

[单选题]
A student measures a distance g yuc bp+ csrs+ 9zpwxslyc(e/0/ 79*mfoa go adkr:a;q,oc/0mgtkkha /m,/ ;6mur times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estihc kgta,g o6kr, d/;aaa/0/m qmko;m: mate 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 a f)v v sv ,g+*b* i94ixiuh)shu-,bqi1xtwsi2nd 38.2 cm) are both 0.2 cmwq+fx,i1t-)h*b iubvsh gi 9u,4v)i 2 ssix*v away from the mean. So C is the correct answer.