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

[单选题]
A student measures a t0rzpdsj8sj-jsqenv + )54- ldistance four times. The readings are 37.8 cm,olf3omcc2+ y; 37.9 cm, 38.1 cm, 38.2 cm. Whmfy ;ol+23o ccat 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 andh:ir u5b(u5 lfoy:q9h 38.2 cm) are both 0.2 cm away from the mean. Sh5uhl :yoifqbr( :5u 9o C is the correct answer.