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 usedd zhno079p/ml j; m)a4ns dwg gsbm1s7b4c0i ;a series of insect traps to capture specimens of beetle A. On the first day, 1656 insects were caught, of which 324 were bemjsda4 mg)s i 1sg4nw07;;cb betle 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 = 1j84z1vif2 m(kwlz*y9 otzw j $\frac{{n_1}×{n_2}}{n_m}$
=$\frac{324×469}{21}$
=$\frac{151,956}{21}$
=7236
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