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

[单选题]
A student measures a distance fou;zaf5 kz0qfy * tl4ub1r times. The readings are 37.8 cm,dz0;b5 axbc9q rk ;fg8 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of this measurx0gk;5ab br;dzc q9f 8ement?

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 (37.8 cm arb3 wak e.ythp+4 y+dgyb6k27nd 38.2 cm) are both 0.2 cm away fy2.6yaw ebrgpk kh7 d+b 4y+t3rom the mean. So C is the correct answer.