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

[单选题]
A student measures a distn ck.814wvi: ij+ds (4(qi-um normapance four times. The iq+ ,:fiu sm3v mq,g5ru-9hmsreadings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. Wq9f3s- :m5m,+ qhivsimu r, ughat 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 (37.8 cm and 38v/ fuyp;xcy;t 1rk20p .2 cm) are both 0.2 cm away from th;pcf 2ytp0 /u 1vxryk;e mean. So C is the correct answer.