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

[单选题]
A student measures a distance four tiqy u wr8g)b,;umes. The readings are 37.8 cm, 37.9 cm, 38.uw;y r)gu 8qb, d.f* 3c0lrnxhdtn :/d1 cm, 38.2 cm. Whatcn/tlx03dh .n* dr f:d 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 extreme, /8c jh qk:(fk6eqrqws (37.8 cm and 38.2 cm) are both 0.2 cm away from 6:8, j(heq rkq/qw fckthe mean. So C is the correct answer.