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

[单选题]
A student measures a ;3s )womho5az h2ys 2g0hltk--p: at5z ac4+i6i are kdistance four times. The readings are 37.8 cm, 37.9 cm, 38.a:y-e2 r+h5si c t-zkk026liagh pt4a1 cm, 38.2 cm. What 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 38.0 cm. The extremeso f3/ sr+okdu9ld6l*t (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C is olts6/odrl9kdu f+ *3the correct answer.