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 au4 a32q)o;g :wpinag o mncv2) distance four times. The readings are 3 xhz8k2em4.ko 7.8 cm, 37.9 cm, 38.1 cm, 38k kzo4m8e h.2x.2 cm. What 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 f qffs*exriv6 evh 2;/l0n pe;l,g1y:cm and 38.2 cm) are both 0.2 cm away fropn xileheslfv*/v;r2,:g0 f 61yq;fem the mean. So C is the correct answer.
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Post time 2024-8-21 21:38:19