CAIE S1 2011 June — Question 4

Exam BoardCAIE
ModuleS1 (Statistics 1)
Year2011
SessionJune
TopicIndependent Events
TypeTest independence using definition

4 Tim throws a fair die twice and notes the number on each throw.
  1. Tim calculates his final score as follows. If the number on the second throw is a 5 he multiplies the two numbers together, and if the number on the second throw is not a 5 he adds the two numbers together. Find the probability that his final score is
    (a) 12,
    (b) 5 .
  2. Events \(A , B , C\) are defined as follows.
    \(A\) : the number on the second throw is 5
    \(B\) : the sum of the numbers is 6
    \(C\) : the product of the numbers is even
    By calculation find which pairs, if any, of the events \(A , B\) and \(C\) are independent.