Question

1. a biologist takes a sample of 80 fish from a stream, and 72 of the fish are rainbow trout. what percentage of the fish are rainbow trout? ? = 8% ? = 90% ? = 11% ? = 72%

Explanation:

Step1: Use the percentage formula

The formula for percentage is $\text{Percentage}=\frac{\text{Part}}{\text{Whole}}\times100\%$. Here, the part (number of rainbow trout) is $72$ and the whole (total number of fish in the sample) is $80$.

Step2: Substitute values into the formula

Substitute the values into the formula: $\text{Percentage}=\frac{72}{80}\times100\%$.
First, simplify $\frac{72}{80}=\frac{9}{10}$.
Then, $\frac{9}{10}\times100\% = 90\%$.

Answer:

$90\%$