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

[单选题]
A student measures a distance four timmiho9/,u3t- +zt iad9u fk xt0es. The readings are 37.8 cm,b w6zaz*aee 25f.(oshgf s+y+ 37.9 cm, 38.1 cm, 38.2 cm. Wha(feeob+ zwsh f*2+.az5ys g6at 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 is axa632fb2hcufhv )6 e38.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C is the f2v3)h66a ahbcuxf e2correct answer.