OCR MEI Paper 2 2023 June — Question 16

Exam BoardOCR MEI
ModulePaper 2 (Paper 2)
Year2023
SessionJune
TopicConditional Probability
TypeVenn diagram with two events

16 Research conducted by social scientists has shown that \(16 \%\) of young adults smoke cigarettes. Two young adults are selected at random.
  1. Determine the probability that one smokes cigarettes and the other doesn't. The same research has also shown that
    • 75\% of young adults drink alcohol.
    • \(66 \%\) of young adults drink alcohol, but do not smoke cigarettes.
    • Determine the probability that a young adult selected at random does smoke cigarettes, but does not drink alcohol.
    • A young adult who drinks alcohol is selected at random. Determine the probability that this young adult smokes cigarettes.
    • Using your answer to part (c), explain whether the event that a young adult selected at random smokes cigarettes is independent of the event that a young adult selected at random drinks alcohol.