In addition to be grouped into four types, human blood is grouped by its Rh fact

Question

In addition to be grouped into four types, human blood is grouped by its Rh factor. Consider the figures below which show the distribution of these types:

                        O         A          B          AB

Rh+                27%     30%     12%     5%

Rh-                  6%       5%       3%       2%

Choose one person at random. Find the probability that the person

a.         Has O negative blood, is a universal donor

b.         Has type B blood given that the person is Rh+

c.         Has AB+ or A- blood

Explanation / Answer

                           O                   A                     B AB                  Total

Rh+                  0.27               0.30                0.12             0.05                  0.74

Rh-                    0.06               0.05                0.03            0.02                  0.16

Total                   0.33              0.35               0.15              0.07                 0.90

(a) P(O) = 0.33/0.90 = 0.3667

(b) P(B/RH+) = 0.12/0.90 = 0.1333

(C) P(AB+ or A-) = (AB+) + P(A-) = 0.05/0.90 + 0.05/0.90 = 0.0556 + 0.0556 = 0.1111

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