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

[单选题]
A student measures a distance four timep e tag3q4/g:2 nc4uuds. The readings are 37.8 b+iyc3-em m(q cm, 37.9 cm, 38.1 cm, 38.2 i3 mm+qbc(ey -cm. What 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 measurements is 38.0 cm. The extremes (37.8 cm and 38w aj dq htt:9lymbn*e+bq; 2/,.2 cm) are both 0.2 cm away from the mean. So C is theal/q t,tq:bj;h be +wn* 9my2d correct answer.