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

[单选题]
A student measures a distance four times. The rupml.y t+il2 vyz(ny6tw--r9 eadingsxjx8qnc07; fv are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. Wh;8 0f jxqv7xcnat is the best 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 measurements is 38.0 cm. The extremes (37.8 cm and 3t4 qh6h:n r/u k5kcvi)8.2 cm) are both 0.2 cm away from the meanq/rn t:u46k kch)v 5ih. So C is the correct answer.