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

[单选题]
A student measures a distanc4clefx9 sj e01/mzs e0i)2 ecae fourvnc80 xzkz-rtia5dfs,/m * c - times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimatd*vz-z/crfs0t x cmik, -a58ne 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 (37.8 cm and 38.2 cm) are 1bsb3 b5i n8bwboth 0.2 cm away from the mean. So C5wb3s b8bnbi1 is the correct answer.