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

[单选题]
A student measures a distance four times. The readings are 37.8 cm, 37..mx i 3kpm.n-w/:ilo g9 cm, t - 8d1rygqivr2si:8 chtjn,o:1 qo/s38.1 cm, 38.2 cm. What i/ 1 2:i1oqtcdq- ovtn8,ysjr: gh rs8is 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.a0 zx351i ofwg0cmdg4c9;q ed8 cm and 38.2 cm) are both 0.2 cm aw 49w1f5gz;0gxo 3cc da0dqmeiay from the mean. So C is the correct answer.