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

[单选题]
A student measures a dist+xap1 iiw )c.lance four times. T7md:x e;ov;um he readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best ede mou :m;;7vxstimate 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.qa,ld+z ;8.ki fdq9 +eqdig 5k8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C is the correct answerq +kgki8qze5f la+ i9d., ;dqd.