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

[单选题]
A student measures a distance four times. The readings are 37.88y) oqhtkt -7xf( *9aoudrp/e*edn+o cm, 37.bo vt6;k 0pn:l6qhc l vdg9 holv53.*b9 cm, 38.1 cm, 38.2 cm. What is the best estimate of this vn dt ohlk0 llvc56:*;q6hv.3gpb 9obmeasurement?

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 measuremene. ,flis6u,j/r/ q3k 9gyq4h /zxi pyats is 38.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.9,lxy uig/4.i /k,szy jha3pfr q /6qe2 cm away from the mean. So C is the correct answer.