Edexcel S1 2015 January — Question 4

Exam BoardEdexcel
ModuleS1 (Statistics 1)
Year2015
SessionJanuary
TopicConditional Probability
TypeConditional probability with algebraic expressions

4. Events \(A\) and \(B\) are shown in the Venn diagram below
where \(x , y , 0.10\) and 0.32 are probabilities.
\includegraphics[max width=\textwidth, alt={}, center]{c58f3e88-2dbc-40d6-a966-a5765a7c67ba-08_467_798_408_575}
  1. Find an expression in terms of \(x\) for
    1. \(\mathrm { P } ( A )\)
    2. \(\mathrm { P } ( B \mid A )\)
  2. Find an expression in terms of \(x\) and \(y\) for \(\mathrm { P } ( A \cup B )\) Given that \(\mathrm { P } ( A ) = 2 \mathrm { P } ( B )\)
  3. find the value of \(x\) and the value of \(y\)