Chapter 4.3 Homework Score: 0/15 0/15 answered .Question 8 A certain virus infects one in every 200 people. A test used to detect the virus in a person is positive 90% of the time if the person has the virus and positive 5% of the time if the person does not have the virus. (This 5% result is called a false positive.) Let A be the event "the person is infected" and B be the event "the person tests positive". Positive Negative | Totals Virus 450 50 500 No virus 4975 94525 99500 Totals 5425 94575 100000 a. Find the probability that a person has the virus given that they have tested positive, i.e. find P(A if B). Round your answer to the nearest hundredth of a percent and do not include a percent sign. P(A if B)= utoring b. Find the probability that a person does not have the virus given that they test negative, i.e. find P(not A if not B). Round your answer to the nearest hundredth of a percent and do not include a percent sign. P(not A if not B) = % Proctor Question Help: Video Message instructor Submit