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

[单选题]
A student measures a distance four times. The readings areuy s:oid nv3g-j .n(/sd pw8n) 37.8 cm, 3e: e/*,a,nnazazr( t* -gn;rz2 bumco 7.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of this met*ru;*maz/nc : e-br,zn2,gn(aza eoasurement?

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 an41 xhm.ro oo-yrs4 q.kd 38.2 cm) are both 0.2 cm away from the mean. Smhosr. k14o - yx4rq.oo C is the correct answer.