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

[单选题]
A student measures a distdbv6jyas4siox: zn1t1d 7r; * ance four timerp05 hul (cojff3 ng1(s. The readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the best foc530 gl(fn ujh(pr1estimate 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 ext *w(ak+ol+ t1bxvxg2oe( 9hfiremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. +2xei 1l+hofga o9b(t*w (v xkSo C is the correct answer.