All human blood can be \"ABO-typed\" as one of O, A, B, or AB, but the distribut

Question

All human blood can be "ABO-typed" as one of O, A, B, or AB, but the distribution of the types varies a bit among groups of people. Here is the distribution of blood types for a randomly chosen person in a country:

(a) What is the national probability of type O blood?
  

(b) Maria has type B blood. She can safely receive blood transfusions from people with blood types O and B. What is the probability that a randomly chosen person from this country can donate blood to Maria?

Explanation / Answer

a) P(type O blood) = 1 - (0.42 + 0.11 + 0.04)

                           = 0.43

b) probability that a randomly chosen person from this country can donate blood to Maria = P(type O blood) + P(type B blood)

                                                       = 0.43 + 0.11

                                                       = 0.54

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