本题目来源于试卷: IB ESS Unit 2: Ecosystems & Ecology，类别为 IB环境系统与社会
[单选题]
An entomologist used a series of insect traps to capture spprl 65k :b2e 2vuen,ipecimens of bee:elk86vtq :l ltle A. On the first day, 1656 insects were c :tk:lvqe6 l8laught, of which 324 were beetle A and were marked. The next day the traps held 1185 insects, of which 21 were marked individuals out of a total of 469 of this species.
Estimate the size of the population of beetle A using the Lincoln index.
Lincoln index = $\frac{n_1 \times n_2}{n_m}$
where
$n_1$ is the number caught in the first sample
$n_2$ is the number caught in the second sample
$n_m$ is the number caught in the second sample that were marked
A. 7,236
B. 15
C. 93,446
D. 30
参考答案: A
本题详细解析:
Lincoln index = 6a875 lk;x2 bxklhpuf;$\frac{{n_1}×{n_2}}{n_m}$
=$\frac{324×469}{21}$
=$\frac{151,956}{21}$
=7236
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