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

[单选题]
A student measures a dista ,b69q4 :)l0wsjpzx j5okkbn; agi;u zt(dxn8nce four 4 x*/uwry.i p oxti6u +4ezku7ehpl83times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What iswxu*+8 6y /4zp.uh7turk i poelx4i3e 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 isw1lp ijn 1efh yr+i:/ 2r(*vaq 38.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C is theerp1fwl2 * /r n+ jq(vaiyi:1h correct answer.