document.write( "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.
\n" ); document.write( "(a) What percentage of times is this spyware detected?
\n" ); document.write( "(b) If a spyware is detected, what is the probability that it has entered via internet? \n" ); document.write( "

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