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If Ted has found his pen while searching for it, determine the probability that it was in his pencil case.
Mathematics 9709 · AS & A Level · The Poisson distribution
The Poisson distribution — practice question
While Ted is trying to locate his pen, the chance that it is inside his pencil case is $0.7$. If the pen is in his pencil case, he always succeeds in finding it. If the pen is elsewhere, the chance that he finds it is $0.2$.
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