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

[单选题]
A student measures a distance four times.wl ym *cg6n 5q56-kojz The readings are6* g j2e zgjlqh:c(5aj n98zmb 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is 5qhj*j cbz aeg:(lgj 92nz8m6 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.fk5;ys; nkp,3/ m(yg cwqyaw 7 4)uukm8 cm and 38.2 cm) are both 0.2 cm away from thew k(mum s4p;)/ky75wknygaf ,3qyu ;c mean. So C is the correct answer.