Each individual in a biological population is assumed to give birth at an exponential rate λ, and to die at an exponential rate μ. In addition, there is an exponential rate of increase θ due to immigration. However, immigration is not allowed when the population size is N or larger.
(a) Set this up as a birth and death model.
(b) If N = 3, 1 = θ = λ, μ = 2, determine the proportion of time that immigration is restricted.
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