A biologist is conducting research on four different types of fish found in a local lake. The numbers of each type are shown in the table.

A table shows the number of fish found in a location. There were ninety small-mouth bass found, two hundred eighty crappies found, sixty sunfish found, and one hundred twenty yellow perch found.

She plans to use a stratified sampling method in which twenty percent of the total population is included in the studies. How many yellow perch will be in her sample?
Answer

6

twenty-four

twelve

eighteen

Question

A biologist is conducting research on four different types of fish found in a local lake. The numbers of each type are shown in the table.

A table shows the number of fish found in a location. There were ninety small-mouth bass found, two hundred eighty crappies found, sixty sunfish found, and one hundred twenty yellow perch found.

She plans to use a stratified sampling method in which twenty percent of the total population is included in the studies. How many yellow perch will be in her sample?
Answer
		
6
		
twenty-four
		
twelve
		
eighteen

anonymous · Answer

you need 20% of each type of fish. 
there are 120 yellow perch.

so you need 20% of 120 yellow perch

0.20 x 120 = 24