1. POPULATION  an entire group of people or objects that you want information about. Sample  the part of the group that is surveyed. This is not new – we used it earlier this year when doing graphs and surveying people.

2. Determining the population when you only have “sample numbers” What can we do????? WE can use proportions!!

3. Let’s try to determine the population of a stream.

4. Missouri conservationists capture and tag 8 fish from our original group. Then release them. A month later they capture a 2 nd group of fish and count how many are tagged. There were 9 fish in the 2 nd group, 4 were tagged.

5. Tagged fish 4 Total fish 9 Let’s use proportions to determine entire population of lake Use cross products property to solve for x – the total population. population

6. Proportions are used to determine populations. Penguin population. Captured and tagged 50 birds. 2 nd grouping – captured 30 birds, 20 are tagged.

7. Homework – create your own population problem and solution This is not team or partner work. Each problem should be unique. Think of a group – you cannot use fish or penguins. Then choose your numbers, Write the problem using words, then math equations and finally solve.