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

[单选题]
A student measures a distance four times(,ck-r1rrj w)wpra- o. The readings axb ,c2zu e7o7kre 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate o,x72oku7 c bzef 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 (37.8 b33f9ab,zd gfcm and 38.2 cm) are both 0.2 cm away from the mean. So C is the correct a, ffb3 z3d9gabnswer.