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

[单选题]
A student measures a distance four timq fbxf a:vdv+d0d 6l +me,)i1les. The readings are 37.m. ;bk f/ nb:v1myvs8w8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of thk8m 1.y; b:/bvsvnfwmis 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,cekpa5 7 *qaj (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C is the coa*ckp75je a,q rrect answer.