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4 marksComplex Numbers

CAPE Pure Mathematics Unit 2 · May/June 2015 · Paper 2 · Question 6(a)(iii)

The weather can be rainy or sunny. If rainy, Alicia attends school with probability 0.7. Alicia attends school on 99% of sunny days. 32% of all school days are rainy.

Given that Alicia is at school today, determine the probability that it is a rainy day.

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Other parts of this question

  1. 6(a)(i)Construct a tree diagram to show the probabilities that Alicia arrives at school.[3 marks]
  2. 6(a)(ii)What is the probability that Alicia is at school on any given school day?[3 marks]
  3. 6(b)(i)Show that the equation y + xy + x^2 = 0 is a solution of the differential equation \frac{dy}{dx} = \frac{y - x^2}{x(1 + x)}.[5 marks]
  4. 6(b)(ii)a)Find the general solution of the differential equation.[3 marks]
  5. 6(b)(ii)b)Hence, show that the solution which satisfies the boundary conditions y(0) = 1 and y'\left(\frac{\sqrt{2}}{2}\right) = 0 is…[7 marks]

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