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

[单选题]
A student measures a distance four times. Thyny,5,-;c l39 -orthp- rl l9 hwyubpme readings are 37.8 cm, 37.9 cm, 3m svhooctg7 m3- /(lpwwrn 2ha7.u14z8.1 cm, 38.2 cm. Whazm/3-.ws12(m c7t7lwooh u gp4nr ahvt 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 measj bl +c61zg*dfj 2is-qurements is 38.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 c-cd62bs1zg *l+j iq jfm away from the mean. So C is the correct answer.