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

[单选题]
A student measures a distance fourv pg12.qqcg) o times. jjtu/-n phm:jo13a : oq4j,euThe readings are 37.8 cm, 37.9 cm, 38.1 cm, 38.2 cm. What is the bes1 nu-/t e::jmojup, j jq4hao3t 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 measure/s/wun+ n1:l39j5qm cjxfq tdments is 38.0 cm. The extremes (37.8 cm and 38.2 cm) are both 0.2 +nqdc/w5 3/nuf1s:x 9ltjmq j cm away from the mean. So C is the correct answer.