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

[单选题]
A student measures a r/n yvo 3( ;dlnl5ayd0distance four timy *ek yj/ll;6ees. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. ye;l/ly *j6ek 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 (37.8 cm and 38.2 cm) sge;6-he148u w yqlqlare both 0.2 y8segw64qlh ;u- l1 qecm away from the mean. So C is the correct answer.