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

[单选题]
A student measures ak9gsp 9n w-n:uncy)xm27, ora distanc bly5 0df-ree+e four times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, - ree b+d50yfl38.2 cm. 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.w* nnkoma 5vqf94.1ir52szdjkzx)u 88 cm and 38.2 cm) are both 0.2 cm away from the mean. So C is the correct ans.zi8nxn*kv5 )o92 jr 5qzk1f4wmsu a dwer.