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

[单选题]
A student measures a did4bp)h-vl,vez ;pu50vkq hd, sus. r/vs4tgy*g-h ;shtance four times. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. Wha-g.*syuhrsg;t4 v s h/t 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 measuremen,ljj iz91 m(2whpr yczm56b.ats is 38.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the me,pb9mmcrl z .w2(hjy6j 15i zaan. So C is the correct answer.