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

[单选题]
A student measures a dist- bbd7v:ompf*9 rb /o4st*zpjance four times. The readings are 37.8 cm,ktfl6vywqc/u tl0(b m3j- 8f wrm. g3q k3c3-q 37.9 cm, 38.1 cm, 38.2 cm. What is 3( t-q8r m33fwtbl gj3qfmywkv.u kc -qc6l/0the 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,. dm-jjs6zee .0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 cm away from the mean. So C j.ze6d,m- ejsis the correct answer.