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

[单选题]
A student measures a d ao/v;uc l*lhukrl 001istance four times. Thecpgnma9/,z 2urpy1a y4 w4js/ readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. Wh/jpacwy21ay/ rn p uz4s4g,m9 at 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 measurem *z xidq6cjus0)09y.k-tk d*: bb vkxzents is 38.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C is the correct a *t s)q9vc zbxj.dbki6k:uz-ky0 x0*d nswer.