A spam filter is designed by looking at commonly occurring phrases in spam. Suppose that
Chapter 2, Problem 1(choose chapter or problem)
A spam filter is designed by looking at commonly occurring phrases in spam. Suppose that 80% of email is spam. In 10% of the spam emails, the phrase free money is used, whereas this phrase is only used in 1% of non-spam emails. A new email has just arrived, which does mention free money. What is the probability that it is spam?
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