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

[单选题]
A student measures a distlutf9 t ee 2/3r(dfhr:x i )k4iw*luv3ance four times.th e6 h9iinbbd,hd+/ 4 The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. W/dhbn +, ei649btidhh hat is the 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 measurementsbr71cl8axx x q1.ny:8 fi 2nh*lqrxu; is 38.0 cm. The extremes (37.8 cm and 38.2 cm) are botu ;yl8 xx2r8q.hl x1qi7cx: *fan1rbn h 0.2 cm away from the mean. So C is the correct answer.