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

[单选题]
A student measures a distancf2l/ rvfcg:bck)9q g /e four times. T9c1b ,aevs t2she readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best ev1s scbt ,2ea9stimate 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. T 5fnm-c,e 6if qdh*px5he extremes (37.8 cm and 38.2 cm) are both 0.2 cm awaxdf5f p qn-i*65,emhcy from the mean. So C is the correct answer.