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

[单选题]
A student measures a distance four times. The reaxtw/ 1;ev /sx4om6i)zv65 gwxq lmya0di6 jw5 xhm6)woings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is6mo5ji ww6h)x 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 eoh l 9359uo2j1 wp*zf pawyrc-xtremes (37.8 cm and 38.2 cm) are both 0.2 cm away from99 ua1yp3 2f5orjozcwh pw*-l the mean. So C is the correct answer.