An ecologist catches 100 frogs from a pond,marks them and releases them back into the pond.After a few days,another 100 frogs are captured and 10 have the marks on them.How many frogs are in the pond?

Question

Quizplus · Accepted Answer

The proportion of marked frogs in the second sample (10 out of 100) should be equal to the proportion of marked frogs in the entire pond. Therefore, if 10% of the second sample is marked, then 10% of the total population is marked. Since 100 frogs were initially marked, the total population is 1000 frogs.

An Ecologist Catches 100 Frogs from a Pond,marks Them and Releases