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

[单选题]
A student measures a d 62-xp vdnk3uvra1vf h0-dm2v afxq xn-mh7j5r)h6g, istance four times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of this mea5rngxfjxh-6) ,q7 ma hsurement?

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. Thp( ( /rk*dydhgi.ey()vjec n:e extremes (37.8 cm and 38.2 cm) are both 0.2.e ydgidv)/j rc e(y:p(kn (*h cm away from the mean. So C is the correct answer.