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

[单选题]
A student measures a distanceu6)8-snzc s 4y/irx or four vw1*ee1p m )ux1r,frstimes. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is theef11eus wx)rr ,v1mp * 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 isl5d)7;9 7q k wojlm/ca ;btxvn 38.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C is the correct answer;w cn)xtdv;797/ ja bqm5 kllo.