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

[单选题]
A student measures a d4;q: j9uvxy(o5q ykw 4aq etm(istance four timjdq p8/c ,3ffmyf7rc9wv. q)qes. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best esf dv9ycq qf/fr.3,pw qm)7 8jctimate 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 0k5k7*.nuh w i0uhgtz 38.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the m0uu t 7whgink0zh .k*5ean. So C is the correct answer.