19. Suppose that 30 percent of computer owners use a Macintosh, 50 percent use Windows, and 20 percent use Linux. Suppose that 65 percent of the Mac users have succumbed to a computer virus, 82 percent of the Windows users get the Virus, and 50 percent of the Linux users get the virus. We select a person at random and learn that her system was infected With the virus. What is the probability that she is a Windows user