In a mark-recapture study, 40 snails are marked and released. A later sample of 30 snails contains 5 marked ones. Estimate the population size.
Answer and explanation
Correct answer: C. 240
- Step 1: Assume the marked fraction in the sample equals the marked fraction in the population: . Step 2. So . Answer: 240. Why not the others: the study counts are combined by proportion, not by adding or multiplying them without the sample size.
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