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

[单选题]
A student measures a distance f7b i:rf txmx u2ndcc00 :.qq7qour times. The readings are 37.8 cm, 37. ,+6j0yv zot*9eqampku2*hg,k a8 qnk9 cm, 38.1 cm, 38.2 cm. What is the best estimat2z*p98ktuq, m o kajvy0haq6 k*ng+e,e 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 rf r9kxmv5ty-x7mh+3n z 2ldw6s)d 3ccm and 38.2 cm) are 6 9 3mxkx7d vmzw2tf)chn35 -+rlr dysboth 0.2 cm away from the mean. So C is the correct answer.