Homework SourseThere are many blood group systems The two most important ar
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 | 0.066 |
Solution
(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.
