Mathematics
Grade 7
15 min
Estimate population size using proportions
Estimate population size using proportions
Tutorial Preview
1
Scientists tagged 10 fish. Later, they caught 20 fish and 2 were tagged. Estimate the total fish population.
2
A park has about 200 deer. Rangers tagged 40. If they sample 50 deer, how many should be tagged?
3
To estimate 500 birds, scientists want 5 tagged birds in a sample of 50. How many birds should they tag initially?
Sample Practice Questions
Easy
Researchers tag 20 butterflies. They later catch 50, and 5 are tagged. Estimate the total butterfly population.
0.100
1.150
2.200
3.250
Easy
15 turtles in a pond are tagged. A scientist catches 10 turtles, and 3 are tagged. Estimate the total turtle population.
0.30
1.45
2.50
3.60
Easy
A lake has 400 fish. 80 are tagged. If you catch 20 fish, how many would you expect to be tagged?
0.2
1.4
2.5
3.8
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