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

[单选题]
A student measures ar ,d+zlu. yt0fj9dh0m lapik n1;8yaumfn 2,5 distance four times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What8fk1y2an;m,5ula in p 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.wc98 h n8h*lv goit*xm v;g8, gv0ro)p The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away fro;tmol9 ghihp)*v88rggnw o v0v,xc8* m the mean. So C is the correct answer.