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

[单选题]
A student measures a distance four times. The bo- u8 ofi7ni ,jjc0k/tuv:n;bx mu:9readings are 37.8 cm, 3ui/um v xm8*l4pd i,ctf9-r6s7.9 cm, 38.1 cm, 38.2 cm. What isr /94uxm, dps8fcviu t ilm*6- 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 e hrd+rgkhfl w,-b06 0extremes (37.8 cm and 38.2 cm) are both 0.2 cm aw dh,lw0ekr0-rgf+ 6 hbay from the mean. So C is the correct answer.