SOLUTION: A system may become infected by some spyware through the internet or e-mail. Seventy percent of the time the spyware arrives via the internet, thirty percent of the time via e-mail

Question 585044: A system may become infected by some spyware through the internet or e-mail. Seventy percent of the time the spyware arrives via the internet, thirty percent of the time via e-mail. If it enters via the internet, the system detects it immediately with probability 0.7. If via e-mail it is detected with probability 0.9.
(a) What percentage of times is this spyware detected?
(b) If a spyware is detected, what is the probability that it has entered via internet?
Answer by 200714402(1) (Show Source): You can put this solution on YOUR website!

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