Question: Immigrants arrive into and emigrate from population a for 20 years. What is the probability that the population grows if immigrants arrive over a period

Immigrants arrive into and emigrate from population a for 20 years. What is the probability that the population grows if immigrants arrive over a period of 40 years? Why does it become larger?
Consider again the populations in Section 7.8, Exercises 33-36. For each population, use the normal approximation to estimate the probability that the population is larger after the given periods of time.

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