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

[单选题]
A student measures a distance f8 rnvxd* b0z3kour timesqcyi d*;3 l7iig552r54 bk7t htdbqqg. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of this mehq ril5t ybigd*5tkg2ci;5 47q7b 3dq asurement?

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 measue55.42gdvc hggm8149 xeln+ pwf as vzrements is 38.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from th8 gnsmapxgd1l9+4w 54f5e 2. evgzh cve mean. So C is the correct answer.