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

[单选题]
A student measures a distance four t5b0y im y:(mm ial7q2limes. Thed m88oxs5)g*tajydh 6 :vt8rq readings are 37.8 cm, 37.9 cm, 38.1 c mox yh)t868 srj:q*dav5gd8tm, 38.2 cm. What 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 (37.8 cm and 38.2 cm) ar4 vgm4 2kd+vtme both 0.2 cm away from the mean. So C is the correct answevkvtm+ 2gdm 44r.