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

[单选题]
A student measures a di bme6l;c af2.ost2r8psn7 e 0npbance four times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best estimate of this measurem7rs 80benppn2 ent?

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 extremesz5r l,r:o6levqf,t3m (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C isr,6lrovml z:,qt35fe the correct answer.