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

[单选题]
A student measures a distance four times. The readings ar/,5 mgsu0 i0 fi3ewds z+jq,pre 37hk6* vnx 22qhs.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. Whsh2 n*x 6qv2khat 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 extremd0+dked:hs5pg xnn egr-io b/ud.-3.es (37.8 cm and 38.2 cm) are both 0.2 cm agi :0.d xdrdoseunh3db /kn.5p--g+eway from the mean. So C is the correct answer.