You may also like

problem icon

Rationals Between...

What fractions can you find between the square roots of 65 and 67?

problem icon

Peaches Today, Peaches Tomorrow....

Whenever a monkey has peaches, he always keeps a fraction of them each day, gives the rest away, and then eats one. How long could he make his peaches last for?

problem icon

Canny Fraction

Weekly Problem 4 - 2012
What fraction of the volume of this can is filled with lemonade?

Counting Fish

Stage: 4 Challenge Level: Challenge Level:1

Image (c)

I need a figure for the fish population in a lake.

I catch 40 fish and mark a scale on each fish so that they can be identified if caught again.

The fish are then released and one week later I once more catch 40 fish and look to see which of these I caught before.

How does this help me come up with a figure for the fish population in a lake?

What assumptions does this method of estimating the fish population rely on?
How do you think you could improve the accuracy of your estimate?

Click here for a poster of this problem.