SOLUTION: In a capture-recapture study, a biologist tagged and released 320 deer. A month later she captured 40 deer, 20 of which had tags. About how many deer were in the population?

Question 962360: In a capture-recapture study, a biologist tagged and released 320 deer. A month later she captured 40 deer, 20 of which had tags. About how many deer were in the population?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
In a capture-recapture study, a biologist tagged and released 320 deer. A month later she captured 40 deer, 20 of which had tags. About how many deer were in the population?
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Use a proportion::
population/caught = # tagged/(tagged that are caught
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n/320 = 40/20
n = 320*2 = 640 (# in the population)
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Cheers,
Stan H.
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