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

[单选题]
A student measures a distann8o f-*x 3:ii(ygg8tau g(*bl:ztgmc ce four times. wo x* ,uk7nvr8-mg)o76bubtp The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 p-ub6xn wvr7ob8guo tm ),* 7kcm. 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. The extremes (37.8 cm and 60xa(zhq7jjqt 7gq5 i;h hxg538.2 cm) are both 0.2 cm away from the mean. So C is the correct 7z hjx aj50q xq7hi qth65(g;ganswer.