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

[单选题]
A student measures a distance four times.47+ )tfpaxes x The re wh1q3/w.ottx adings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of thi /qtw13xhow.t s 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 cm afn)w nvpxhm 7+m ff3)/nd 38.2 cm) are both 0.2 cm away from the mean. Som f7nfh +np w3m/v)f)x C is the correct answer.