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

[单选题]
A student measures a distance four times. The readings are 37.8 cm, 3) 4xyyzwx-ox jos+e(+ 7.9 cm, 3a; mepx :s+n0*sxq* :)uiahkt8.1p:e *sxs ua)i h0+anx*q:ktm; 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 measurements is 38.0 cm. The extremes k3g hkfxmdly/g51+d. (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C is the codd g.yh mkf+k /lx351grrect answer.