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

[单选题]
A student measures a distance four times. The readings cnj/k lnd;65czm0mp 6 are 37.8 cm, 37.9 cm, 2sxqpt-5t t47ru iq-m38.1 cm,2 tstx5mq r-q-tip74 u 38.2 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 anddht,yy(bdvxgu4e-ngt m7al .i;:7do v13 z( f 38.2 cm) are both 0.2 cm away frodg o (4n lxv7: ;mhye3f1(.daditg-y7vu bz,tm the mean. So C is the correct answer.