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

[单选题]
A student measures a bjhq9xxm: sco;26s 2c56cwwriaa 8bz c5o2 y2distance four times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is 8cw22 i6awrbocy55za 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 measurementsh cn(-s9+y1wlk1r,kun+ r w oj is 38.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean.kh1j,yw1r-ul n os+(r+knw9c So C is the correct answer.