Question

select the button to take a sample of fish. what is the ratio of the average number of catfish to the average number of all fish in the samples? average number of catfish / average number of fish = ((3 + 5+ 7)/3)/20 o 1:7 o 1:4 o 2:5 o 3:4 fish type sample 1 sample 2 sample 3 brook trout catfish smallmouth bass

Explanation:

Step1: Calculate average number of catfish

The numbers of catfish in the samples are 3, 5, 7. The average number of catfish is $\frac{3 + 5+7}{3}=\frac{15}{3} = 5$.

Step2: Assume total number of fish in samples

It seems from the given ratio - setup that the denominator for the average number of all fish is 20. So the ratio of the average number of catfish to the average number of all fish is $\frac{5}{20}$.

Step3: Simplify the ratio

$\frac{5}{20}=\frac{1}{4}$, which is equivalent to 1:4.

Answer:

1:4