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

[单选题]
A student measures a distance four times. T) ) /ofvbxk1 cqffiy7k.x7 *nphe readingbhb6n0o( xm n2*qi9 nos are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is0o *nqn 2hmibb9xon( 6 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 exgq(v+mu hy+8t tremes (37.8 cm and 38.2 cm) are both 0.2 cm away frtu+8vgh(m y+ qom the mean. So C is the correct answer.