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

[单选题]
A student measures a distance p+:xdpk hdc rej81 -wfa6e ch*796xy ufour times. T ri*o::(q plephe readings are 37.8 cm, 37.9 cm, 38.1 cm,:ieo*(lpr qp : 38.2 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 78532 z8u. r brqwh, ebvwpbv**haxibcm and 38.2 cm) are both 0.2 cm away from the mean. So C is the correct answer.aw87uh*x z.br2 5r bwvp* ,bqb8veih3