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

[单选题]
A student measures a k;u6fcm)ajqxll0 6.- h )lh g:kg:vlpdistance four times. The readings are 37.8 cm, 37.9 cm, be2e/nghd)) qfu3nyw .ju4a;38.1 cm, 38.2 cm. What is the best;fh ug2.)a ) qdebn3/juwen y4 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 measurem0w-p 5;mn4s :k0pgscqd0on thents is 38.0 cm. The extremes (37.8 cm and 38.2 cm) are csw4 gs-n pon :0d0m0t;5kqphboth 0.2 cm away from the mean. So C is the correct answer.