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

[单选题]
A student measures a distance four times. The re9kryg *c;jf(xsz7 s3yyj4 u k3adings are 37.8 coj: johdsm,. 3c-.k rcm, 37.9 cm, 38.1 cm, 38.2 cm.:k,c.omcr - oj dhj.3s What 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 extremest+m)jkqr mq/ / (37.8 cm and 38.2 cm) are both tmj+/m q/k) qr0.2 cm away from the mean. So C is the correct answer.