​A Population Ecologist Wants to Estimate the Size of a Robin

Multiple Choice

​A population ecologist wants to estimate the size of a robin population. In an apple orchard, she captures 10 robins, marks them, and then releases them. She returns several weeks later and captures another 10 robins, of which 2 are robins she previously marked. The estimated population size of robins is ____.

A) ​50
B) ​15
C) ​10
D) ​200
E) ​20