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

[单选题]
A student measures a 8y4orrtfoq4, .aaijw5; r3 dudistance four tt wle s1o9i;7eay o1.jg g/a-vrj( z5cimes. The readings are 37.8 cm, 37.9 cm, 38.1il5azj1w;s ygo o 1teejg acr(v7-./9 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 measure51u1:eqjc rjmnto3d +ments is 38.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the metm3c 1o qnj:rd5ej+u1an. So C is the correct answer.