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

[单选题]
A student measures a distance fou0uxtbk vf/k+b4d:)h b2 u f8pcr ti3jc i8tmte1c+mes. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.et+t8 1 3mcijc2 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 measurements7sa m,3qx y*ybe( u+sdsow/vh*7 9rlr is 38.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C isvyrbhe3s w97 (*/umsy*rqsa,dl+ o7x the correct answer.