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

[单选题]
A student measures a distance+wfodno igw/ ov9 in2*u -0k4sav/v7j four times. Thtp8r.imm v 3qs t;b 0d1jw3g-he readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of thitq0i8.dmtvs1j ;gw3bp3m r h-s 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 38.0aewtmr e/x87 8;s5ysk cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm awar ea8 ;7s8twey/smkx5y from the mean. So C is the correct answer.