Mathematics · Probability
Human blood can be classified into four common blood types—A, B, AB, and O. It is also characterized by the presence (+) or absence (-) of the rhesus factor. The table below shows the distribution of blood type and rhesus factor for a group of people. Rhesus factor A B AB O + 33 9 3 37 - 7 2 1 x If one of these people who is rhesus negative (-) is chosen at random, the probability that the person has blood type B is 1 9 . What is the value of x?
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