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

[单选题]
A student measures a distancel,j g 2n1auyaw n6j 1:*dw:uuw four times. Theh4i 3w- ygkw aecy 9o6 ud9h75hk78xjr readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is th wx-ri9hya98dhw hj7e3kuoyc5 4 6 7gke 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 extremevo477rmpw24drjso/+ oo kh;a a 2o yl2s (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So Ca; 7ao/d4wo 2+ro v4 yh2r2klopjmo s7 is the correct answer.