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7. A spam ler is designed by screening commonly occurring phrases in spam. Suppose that 60% of email is spam. In 20% of the spam

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7. A spam ler is designed by screening commonly occurring phrases in spam. Suppose that 60% of email is spam. In 20% of the spam emails, the phrase \"free gift card\" is used. In non-spam emails, 99.5% of them do not mention \"free gift card\". What is the probability that a newly arrived email which does mention \"free gift card\

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