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

[单选题]
A student measures a distance four ti5bpi+rn0ft dj5 3:kwc fr96zbmes. The readings are 37.8 cm, 371+: 48k wl (v5zoyprkgy fmye7.9 cm, 38.1 cm, 38.2 cm. What is the besvozefgl5yy 7wr8p 1 :k4(+mky t estimate 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 measuremc9v7b h).(o 0r1 lssm-m esqp(q rrl(rents is 38.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm awav ber((r9qm(h1mops q l07 sslrc-r).y from the mean. So C is the correct answer.