# Question: Software filters rely heavily on blacklists lists of known phishing

Software filters rely heavily on "blacklists" (lists of known "phishing" URLs) to detect fraudulent e-mails. But such filters typically catch only 20 percent of phishing URLs. Jason receives 16 phishing e-mails.

(a) What is the expected number that would be caught by such a filter?

(b) What is the chance that such a filter would detect none of them?

(a) What is the expected number that would be caught by such a filter?

(b) What is the chance that such a filter would detect none of them?

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