SOLUTION: Ok just one more: As part of a conservation effort for a lake, 40 fish are caught, tagged, and then released. Later 80 fish are caught. Four of the 80 fish are found to have tag

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Question 61776This question is from textbook
: Ok just one more:
As part of a conservation effort for a lake, 40 fish are caught, tagged, and then released. Later 80 fish are caught. Four of the 80 fish are found to have tags. Estimate the number of fish in the lake.
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Answer by stanbon(75887) About Me  (Show Source):
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40 fish are caught, tagged, and then released. Later 80 fish are caught. Four of the 80 fish are found to have tags. Estimate the number of fish in the lake.
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Use a proportion comparing the sample and the population, as follows:
80/4=x/40
x=40*20
x=800 fish in the lake
Cheers,
Stan H.