Matrices — Question 70
Original QCE Vault practice · 6 marks
Q70 · Practice questionComplex familiar6 marks
QUESTION 70 (6 marks)
A population has Leslie matrix L=00.501.400.62.000,p0=20012080. a)Determine p1 and p2. [4 marks] b)Determine the percentage change in total population from p0 to p2. [2 marks] WORKED SOLUTION
Practice marking scheme
6 marksANSWER(a) (328,100,72)T and (284,164,60)T; (b) 27% increase. Worked solution
(a) p1=Lp0=1.4(120)+2(80)0.5(200)0.6(120)=32810072. Multiplying again, p2=Lp1=1.4(100)+2(72)0.5(328)0.6(100)=28416460. (b) The total population changes from 200+120+80=400 to 284+164+60=508. The percentage increase is (508−400)/400×100%=27%. Determines p1. [2 marks]Determines p2. [2 marks]Calculates the two totals.
[1 mark]Calculates the percentage change.
[1 mark]Practice question aligned to the current QCAA syllabus; review the worked solution and marking criteria.
View the QCAA syllabusHow many marks did you earn?Compare your working with the guide above.
Related questions
- Q40 · Original practice · 7 marks
Consider the system x+y+z2x+3y+4zx+2y+(a2−5a+9)z=3,=8,=a+3. Use Gaussian elimination to classify the system as having a unique solution, no solution or infinitely many solutions for all real values of a. Where the solution is unique, determine it in terms of a. Matrices - Q42 · Original practice · 6 marks
Four competitors A,B,C,D have dominance matrix D=0001100011000110. A competition uses the score defined as the row sum of D+D2. Matrices - Q44 · Original practice · 5 marks
A three-class population is modelled by L=00.400.800.61.500,p0=15010050. Matrices - Q47 · Original practice · 1 mark
An augmented matrix in row-echelon form has final row [0003]. The corresponding system has Matrices