## anonymous one year ago The following table shows the data of a random sample of fish collected from and later released into a lake: How many bass are estimated to be present if a random sample of 1,500 fish is collected from the lake? Type of Fish Bass Catfish Warmouth Number of fish 60 70 20

1. DanJS

(sample size) * (# bass) / (Total Fish)

2. DanJS

Take the fraction that are bass, and multiply that by your sample size

3. anonymous

60/1500?

4. DanJS

Ok, in the sample, there are 60 bass and (60+70+20) = 150 total fish

5. DanJS

the fraction that are bass is 60/150

6. DanJS

or 2/5 or 40%

7. anonymous

8. DanJS

If 1500 Fish are sampled, you would expect 40% to be bass

9. DanJS

1500*0.4 = 600 estimated bass

10. DanJS

This is what we did $\frac{ 60 }{ 60+70+20 } = \frac{ x }{ 1500 }$

11. DanJS

Just scaled up the sample size to 1500 from 150 with the same expectations on percent of bass

12. anonymous

@DanJS how would I come to the total

13. anonymous