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

[单选题]
A student measures a d 53lielmaek5/istance four wj0k,i50 /q s.braryb times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is w0.r sqak50by j,/irbthe 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 extremes (37.8 cm and s1wrhwef5 i5y,s c;v) a)rquh+i :1oy38.2 cm) are both 0.2 cm away from the mean. So C is qsi:r ceys iyah,r)w;hov 1u551f )+w the correct answer.