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

[单选题]
A student measures a distance four times. The readingsc,ob8 fe /i 4m(g4jumlso m+n8ew fsxu0n gz:v +)om(5 are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. Whatzoum:f+(gv50w) nxes 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 i x zceuk*bxkps7 ((uf2y,a0)p s 38.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the meaxuey,u 0p2s fkk(7a(czb) *pxn. So C is the correct answer.