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Website testers in Group A used either Explorer or Chrome browser. Some experienced getting virus. Explorer Chrome Virus 8 5 No virus 22 25 a)

Website testers in Group A used either Explorer or Chrome browser. Some experienced getting virus.

Explorer Chrome
Virus 8 5
No virus 22 25

a) Find the probability that a randomly selected tester used Chrome or got no virus.

b) Find the probability that a randomly selected tester got virus given that the tester used Explorer.

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