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

[单选题]
A student measures a dist:-mjp6hw8as r q h8kzr.-/:kgql7tkkc6wx t8ance fouim wgg,,fxxj67 kfd i: ab-9-br times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of this measurkfijx gw:d-xf,9 am6-b ig7b,ement?

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 d* k/15x-ondf+v6nqc2 sxt 3lu qz8mais 38.0 cm. The extremes (37.8 cm and 38.2 cm) are both nq6qdzt af 8x5 u nxvd1c+sk*/m3l-o2 0.2 cm away from the mean. So C is the correct answer.