A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is

Question

Dr. Abubacker · Accepted Answer

[Solution from source] Change in population = (natality + immigration) − (mortality + emigration) = (250 + 20) − (240 + 30) = 270 − 270 = 0. Taking only natality minus mortality gives the trap answer 10. Answer (4).

Q. A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is

Explanation

Reviewed by Dr. Abubacker

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