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

[单选题]
A student measures a distance four times.hygm+ctmsi6 dd)8z *2n q ,egz7c8j3h The rqh -*jtk v5d-5h nr5sreadings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of this measuremth-5nd5r sr kq-* hv5jent?

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 anumpr,jq* 8xq: d 38.2 cm) are both 0.2 cm away from: ,u8mqj*p qxr the mean. So C is the correct answer.