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

[单选题]
A student measures a distanc)3msjhvv iw3 j))gj3 xe four ti.n1hnu p/2:x 68vtnrp,cf pxa mes. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. Whaxp2: f nt18 ,nup.6a cxhnp/vrt 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 (3 :jcsecx3dm9je r /r;37.8 cm and 38.2 cm) are both 0.2 cm away from the mea s 3r xcmd3ejr9:ec;/jn. So C is the correct answer.