You catch, tag, and release 35 fish back into a pond. Then, you catch 70 more fish, 12 of which have tags on them. What is the best estimate of the number of fish in the pond?

Estimate the pond’s population by multiplying the number of tagged fish by the number caught in the second sample, then dividing by the number of tagged fish in that sample: 35 × 70 ÷ 12 ≈ 204. So the best estimate is 204 fish, choice D.

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