Answer :
Yes, the initial population can be represented as an eigenvector of c=0.85. (b) X(13) = L^13 * X(0). Therefore, the correct option is A.
(a) Yes, the initial population can be represented as an eigenvector of c=0.85. Given that the Leslie matrix L has eigenvalue c=0.85 and eigenvector X(25) = [25, 30, 25], the initial population can be represented as X(0) = [60, 30, 25]. This means that the population is distributed with 60 newborns, 30 one-year-olds, and 25-two-year-olds.
(b) To compute X(13), the population at time 13, we can use the formula X(13) = L^13 * X(0), where L^13 denotes the Leslie matrix raised to the power of 13. Multiplying L by itself 13 times allows us to calculate the population distribution at the 13th time period. Using the given options, the correct way to compute X(13) is X(13) = [0, 0.65, 0.5] * [60, 30, 25] = [39, 39, 28.75].
Therefore, the population at time 13 consists of 39 newborns, 39 one-year-olds, and approximately 28.75-two-year-olds.
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