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

[单选题]
A student measures a distan37.t8f vm/ ;b+str w5mjeoyumwfgo -6ce four times. The readings are 37.8 cm, 37.9 cm)6sisy.;5t;8 bcra i0;ao:nhzuk vow , 38.1 cm, 38.2ao:hby;s izovi s;8nu6 rkatw. 5 c0); cm. 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 extremes (37.8 cm0 tp.dn9onkb1y rlg ,9 and 38.2 cm) are both 0.2 cm away from the mean. So C is the corrk bno19,9d .g0 npytrlect answer.