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

[单选题]
A student measures a distano,c,qvifnefh xyjk:0s : 4 5ibd5: 6gpce four times. The readings are 37.oc22+sqi x(lmyk+f eh9n gu 8d.dck0.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What i i8lksmqx od+uc g9yc(.en2h .0+kf2 ds 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 y3q 4osxx. gu/q; -fsn38.2 cm) are both 0.2 cm away fx -nssq;3q ./xo4ugyfrom the mean. So C is the correct answer.