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

[单选题]
A student measures a distance four times. The read 6m ojj)p*fhw5ings are r beoyo9 0 bss.z2+)vy37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is th) bbrs2.vo+sy 9ye 0zoe 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. Tza1svswsw 6bs2 c 4p3(fi* bd(he extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C is th *b 61dfwi2sb ws4ap(z3ss(vce correct answer.