Mathematics
Grade 8
15 min
Estimate population size using proportions
Estimate population size using proportions
Tutorial Preview
1
Scientists tag 50 fish. They later catch 100 fish, and 10 are tagged. Estimate the total fish population.
2
A park has tagged 80 deer. A helicopter spots 60 deer, and 20% of them are tagged. Estimate the total deer population.
3
Biologists estimate 1,200 birds are on an island. They catch 150, and 15 are tagged. How many birds were originally tagged?
Sample Practice Questions
Easy
Researchers tag 20 turtles. They later capture 50 turtles, and 10 are tagged. Estimate the total turtle population.
0.50
1.100
2.200
3.500
Easy
To estimate a squirrel population, 10 are tagged. Later, 40 are caught and 2 have tags. Estimate the total population.
0.100
1.150
2.200
3.400
Easy
A farmer tags 30 sheep. In a later count of 60 sheep, 3 are tagged. Estimate the total number of sheep.
0.300
1.600
2.900
3.180
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