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

[单选题]
A student measures am /r6;od(b+ p9x tuwga distance fos 5ib 4nen2un14bjp02* jxaopds(no;ur times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of this measureejun(dp5sjnn1oi 44 snb 2o ap;0xb*2 ment?

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 and 38.2 cmgk5p*w k6yl-f) are both 0.2 cm away from the mean. So C is the cok pfkwgl6 y5-*rrect answer.