There are many blood group systems. The two most important are ABO type (A, B, A
ID: 3023415 • Letter: T
Question
There are many blood group systems. The two most important are ABO type (A, B, AB, O) and Rh factor. (+ or -) According to the Stanford Blood Center, in North America, the probability that a randomly chosen person has a particular combination of these two systems is:
For example, the probability that a randomly selected individual has the blood type AB+ is 0.034.
(a) What is the probability that a randomly selected North American has an Rh factor +?
(b) Given that a randomly selected North American’s Rh factor is +, what is the probability that their ABO type is B?
(c) What is the probability that a randomly selected North American has an ABO type of O?
(d) Given that a randomly selected North American’s ABO type is O, what is the probability that their Rh factor is -?
A B AB O + 0.357 0.085 0.034 0.374 - 0.063 0.015 0.006 0.066Explanation / Answer
(a) The probability that a randomly selected North American has an Rh factor + =0.357+0.085+0.034+0.374=0.85.
(b) The probability that their ABO type is B is 0.085.
(c) The probability that a randomly selected North American has an ABO type of O is 0.44.
(d) Given that a randomly selected North American’s ABO type is O, then the probability that their Rh factor is - is 0.066.
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