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

[单选题]
A student measures a distance four6wh 4iziru :(gqm2f(v8 n s3ft times. The readings are 37.8 cm, 37.9 cm, 38.q32wim(h4fris6fg n(tv zu : 85 h*fw) fyqcsv,9stb 51 cm, 38.2 cm. What is the best estimate ) 5h5f,9qtwfy *ssvcb 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 6oekp)lp l 94jgm xufty6 p4:)cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm a6jlp pgf4lympuko:e) 9xt6 )4way from the mean. So C is the correct answer.