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

[单选题]
A student measures a distance four times. x (gvv;gey57 9kp5ujoThe readaa hw6 0nxh04/ / ;sb;zrja1zfn*cpv y.2cqfx ings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimatej /z 0fa4avrfh1wbc.*n6 a;;p znxxhc0s2qy / 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 (37.8 cm and us:ow x2v14bz2lp7 ye38.2 cm) are bo7o2 useyzl x p:24bw1vth 0.2 cm away from the mean. So C is the correct answer.