Edexcel S1 2005 January — Question 1

Exam BoardEdexcel
ModuleS1 (Statistics 1)
Year2005
SessionJanuary
TopicTree Diagrams
TypePopulation partition tree diagram

  1. A company assembles drills using components from two sources. Goodbuy supplies \(85 \%\) of the components and Amart supplies the rest. It is known that \(3 \%\) of the components supplied by Goodbuy are faulty and \(6 \%\) of those supplied by Amart are faulty.
    1. Represent this information on a tree diagram.
    An assembled drill is selected at random.
  2. Find the probability that it is not faulty.