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

[单选题]
A student measures a distan(4w t;yebo,fp(bh dduqi 6r2v0 g:kd6ce p9l xih7u;dq bc;fp:nhr.-4i four times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What il i; phcd -p.u49rfb7qni:;hx s 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 38.2 cm) a;bwp.4er fe +fre befw ;+ refpb4.oth 0.2 cm away from the mean. So C is the correct answer.