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

[单选题]
A student measures a distance four times. The readings are6mg g)hh kkos47a8( ,lmqsc28,euujb 37.8 cm, 37.9 cy * sudwb5z c h w--4zqj)vp)hgrto2()m, 38.1 cm, 38.2 cm. What)v udgw)-zp(r w542os-zjhq chy bt*) is 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 (37hbk;.s1f qs) b2mxe 9o.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C is th9o ) 1bxqf2.;ebmhssk e correct answer.