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

[单选题]
A student measures a 3h0f-p tgb sa9eifq bs 4 fv0ef39v;(gdistance four times. The readingq3 n a)o*c9iyns are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is ta)qcn93 y*noi 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. yef4l7n li2vh13w;is7s 8utf The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from tl;478ln f1h3i 27twvuyf seishe mean. So C is the correct answer.