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

[单选题]
A student measures a distance01w9 )si59km ugd um -sshk:mc fo3g;z8u7eoc mu exq5 t5ur times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cmx7 5eoez5gm c3uqut;8 . 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+1i*l e/3p i6x1wlsb v myf-gi (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C is the corseg w b-6ifivp1/*1i3x+yl mlrect answer.