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

[单选题]
A student measures a4 s78hyt)i)t ama4tdi rsu.c. d uwh9p;yu+-y pistance four times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of y;9hwpyuu- p+ 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 y*s aono cr288jlw06jboth 0.2 cm away from the mean. So C is the cor*j 62ocrals w yon8j08rect answer.