SOLUTION: Question: You ask your roommate to mail a letter for you. Suppose there is a 0.17 probability your roommate will forget to mail it. Should your roommate mail your letter, there is

Question 909034: Question: You ask your roommate to mail a letter for you. Suppose there is a 0.17 probability your roommate will forget to mail it. Should your roommate mail your letter, there is a 0.91 probability that Canada Post will deliver the letter. If the letter is never delivered, what is the probability your roommate mailed the letter?
Thank you!
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
P(A|B) = P(A and B)/P(B)
P(not delivered|mailed) = P(mailed and not delivered) /P(mailed) = .09/.83
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