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

[单选题]
A student measures a distance four times. 6 nv+-ua9kh gpThe readings are 37.8 ez8zj 3m 44twf v*3 cm(kui6nacm, 37.9 cm, 38.1 cm, 38.2 cm. What is thec(ezj w83*6fut4mniv 43ka zm 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 cmsu* 8. rys re:dj++ynh. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm awydyne: .h+j 8ru+ssr*ay from the mean. So C is the correct answer.