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

[单选题]
A student measures a distanc8rtsiih s034 ji6 hai1e four times. The readings are 37.8 cca .fg /doglc+7aoiqojc a rm-)7)9g )m, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of this measur)c.go7+ aglci )q 7-acda)of mjog9/rement?

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 ehsnnb;k +6xe4 xtremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. 6+shk ;b enxn4So C is the correct answer.