Question

In a small Alaskan Lake there were pink and jumbo salmon. Jaime caught 5 pink and 7 jumbo salmon. She estimates that there are 720 salmon in the lake. If this sample represents the lake's population, how many of the estimated 720 salmon in the lake are jumbo salmon? A.300 B.420 C.360 D.450

Answer 1

If the sample represents the lake's population, we can say that for every 12 salmon, 5 are pink and 7 are Jumbo

Now, we can calculate the number of Jumbo salmon using a rule of three, where we know that for every 12 salmon, 7 are Jumbo, then for 720 salmon, how many are Jumbo. So:

12 salmon ---------------- 7 Jumbo

720 salmon ------------- X

Where X is the estimated number of Jumbo salmon.

Solving for X:

`X=(720\cdot7)/(12)=420\text{ Jumbo}`

Answer: B. 420