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

[单选题]
A student measures a distxdd,.kv/k t/f r/obq:rp.o (nance fou/seq2idjch3s90 nkk8d. lj0z r times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate/q is2d.ljsj3d8cekhn9 k00z 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 extremes (37.8 cm and 38.2 2tgv blx/sf7;cm) are both 0.2 cmb2/ fl7vg;sxt away from the mean. So C is the correct answer.