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

[单选题]
A student measures a distance four times. The r q9+gmjaf-i 77zqvb4oeadings are 37.8 cm, 37.sgr1t/ :iq8 vfvvh 9(v9 cm, 38.1 cm, 38.2 cm. What is the best estimats fvqhv8vi1vg r(: t9/e 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. Thht1j4mf i-8dhe extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. Sohd1h8 -t jmif4 C is the correct answer.