Q199 · Practice questionTechnology-freeComplex unfamiliar5 marks
QUESTION 199 (5 marks)
A population follows with f>0.
a)[3 marks]
Determine f and the positive stage ratio for a vector unchanged every step.
b)[2 marks]
For f=1.5 and initial vector (100,100), find total expected population after two steps.
WORKED SOLUTION
5 marksPractice marking scheme
ANSWER
(a) , . (b) .
Worked solution
(a) A fixed vector satisfies J=fA and A=0.4J+0.6A. The latter gives J=A, and the former then gives f=1 for positive counts.
(b) The first update is (150,100), the second (150,120). Total population after two steps is 270.
Equivalent mathematically justified methods accepted.
Exact answers unless a decimal accuracy is specified.
Part a: Form both fixed-vector equations.
Part a: Obtain J=A.
Part a: Obtain f=1.
Part b: Calculate the first update.
Part b: Calculate the second update and total.
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