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

[单选题]
A student measures a distance four times. The -/dfnzx55yp qi6 2 ivfreading2qvt 5 h-p f8i+ljfj2t(hxr7o j -tbw6s are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of this mea(- opt7t2j hbhj -f2jwr i+6f8lxv5q tsurement?

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 5s+pesha9 qx7 2e*y6u- dcydx38.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C iqd2ea6 dx+-hs57*s cxy9pu e ys the correct answer.