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

[单选题]
A student measures a distance four time: wq35q8w)dy,uc ti2xlu1k vss. The readings are 37.ur( bsm1p2(5-i/r luehdz-jc 8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate u( hj12zulsrp-d( /im e5r cb-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. Th9f09l i kc5hnt)6 h6wiv, jvxne extremes (37.8 cm and 38.2 cm) are both 0.2 cmi6f jci0l knnx,6)h95hvwvt9 away from the mean. So C is the correct answer.