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

[单选题]
A student measures a distance four times. The read3w e6vuzqtj p g,r.v2ir v77-jit m; +g 2n xs2aa1vu4ml5qhxy/a(nt .angs are 37.8 cm, 37.9 cm, 38.1 cma;5 2t yaht4xn1/ umvngl qsaa(. m2+x, 38.2 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 measurements is 38.0 cm. Thehctl 7vzhh 0kh/o22 aq)3 iw8e extremes (37.8 cm and 38.2 cm) are bo w 2k/qa)h0hl7zteh2h3oi8 v cth 0.2 cm away from the mean. So C is the correct answer.