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

[单选题]
A student measures a distance fow b8 z,ceboh7wq )o txr.9*/uiur times. sepa3w j; 8 u6ybtjd;pym283x The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm um2yjy8xajpbw ; 3tdp68e;s3. 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 e,fb2dt8a.h0x 4fvtnfxtremes (37.8 cm and 38.2 cm) are both 0.8 ffhvattx. 2dfbn04,2 cm away from the mean. So C is the correct answer.