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

[单选题]
A student measures a distance four timd-hthncx hh67r .r5f:es. )rmf 9z23bnly The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of this measbnfzm3l9y) r 2urement?

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 measuremeblv( o/xglxcxu8s6b0y (7t r 4nts is 38.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean.lbyxgc0ux(7 xtso( r bl68v/4 So C is the correct answer.