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

[单选题]
A student measures a distance four.p s1zsd gd07s2li;x 4e; hwxz tio i) i nikr:nyrmk*/vv .79lw.mes. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of :n/ ykmiii.vvwrro*)l9k. 7 nthis 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 extr 597lxy0;)ecx2qg: * ijrl-yk6nnyn wgp*x ovemes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C is the cor:eynqx yn6l) lx0ipcr;v - n5wg*79gxj y2ko*rect answer.