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

[单选题]
A student measures a di 6 r)dbsr/fvrngags )d-0(zcrm*77t3x:a xnsstance four times. The readings are 37.8 cm, 37.9 c 0 hy yz f-)aq5c:w jnfdz7fyy/*gsg68m, 38.1 cm, 38.2 cm. W wyz c/zn*g0 6)j8 yysfg7hfa5fqyd:-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 measur . kfp5*,e uzz2fec9upements is 38.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm p,pe z u 9f*ce2ku.5zfaway from the mean. So C is the correct answer.