Cystic fibrosis. Cystic fibrosis (CF) is a hereditary lung disorder that often results in death. It can be inherited only if both parents are carriers of an abnormal gene. In 1989, the CF gene that is abnormal in carriers of cystic fibrosis was identified. The probability that a randomly chosen person of European ancestry carries an abnormal CF gene is 1/25. (The probability is less in other ethnic groups). The CF20m test detects most, but not all, harmful mutations of the CF gene. The test is positive for 90% of people who are carriers. It is (ignoring human error) never positive for people who are not carriers. Jason’s CF20m test is positive. What is the probability that he is a carrier?

A First Course in Probability (10th Edition)
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Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Cystic fibrosis. Cystic fibrosis (CF) is a hereditary lung disorder that
often results in death. It can be inherited only if both parents are
carriers of an abnormal gene. In 1989, the CF gene that is abnormal in
carriers of cystic fibrosis was identified. The probability that a randomly
chosen person of European ancestry carries an abnormal CF gene is 1/25.
(The probability is less in other ethnic groups). The CF20m test detects
most, but not all, harmful mutations of the CF gene. The test is positive
for 90% of people who are carriers. It is (ignoring human error) never
positive for people who are not carriers. Jason’s CF20m test is positive.
What is the probability that he is a carrier?
Transcribed Image Text:Cystic fibrosis. Cystic fibrosis (CF) is a hereditary lung disorder that often results in death. It can be inherited only if both parents are carriers of an abnormal gene. In 1989, the CF gene that is abnormal in carriers of cystic fibrosis was identified. The probability that a randomly chosen person of European ancestry carries an abnormal CF gene is 1/25. (The probability is less in other ethnic groups). The CF20m test detects most, but not all, harmful mutations of the CF gene. The test is positive for 90% of people who are carriers. It is (ignoring human error) never positive for people who are not carriers. Jason’s CF20m test is positive. What is the probability that he is a carrier?
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