Spam filter
30% of incoming email is spam. The word "free" appears in 60% of spam and 5% of legitimate mail. An email contains the word "free." What is the probability it is spam? Give your answer as a decimal (to 2 decimals).
Show hints (2)+
- Weight "free in spam" and "free in legit" by their base rates.
- Then normalize over both ways the word can appear.
Answer
Reveal answer →Final answer
0.84 (± 0.01)
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