Edexcel S2 2010 January — Question 1

Exam BoardEdexcel
ModuleS2 (Statistics 2)
Year2010
SessionJanuary
TopicBinomial Distribution
TypeIdentify distribution and parameters
  1. A manufacturer supplies DVD players to retailers in batches of 20 . It has \(5 \%\) of the players returned because they are faulty.
    1. Write down a suitable model for the distribution of the number of faulty DVD players in a batch.
    Find the probability that a batch contains
  2. no faulty DVD players,
  3. more than 4 faulty DVD players.
  4. Find the mean and variance of the number of faulty DVD players in a batch.
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