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

[单选题]
A student measures a diul7 2yv2z6u,d ji q8chstance four ti /33 zd00a1 zkdt(ciiv kve/kymes. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of this measurement?ikc(v z3 vkty3dd1ei0a/ z k0/

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 extrvur 9h;uv8g 3ov:bw 8xemes (37.8 cm and 38.2 cm) are both 0.2 cmu ugvr: ox ;b838h9vvw away from the mean. So C is the correct answer.