All Human Blood Can Be Typed as Either O, A

Multiple Choice

All human blood can be typed as either O, A, B, or AB. The distribution of the types varies a bit with race. Choose an African American person at random. Here are the approximate probabilities that the person you choose will have blood type O, B, or AB:
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$$\begin{array} { | l | l | l | l | l | } \hline \text { Blood type } & \text { O } & \text { A } & \text { B } & \text { AB } \\\hline \text { Probability } & 0.50 & ? & 0.20 & 0.05 \\\hline\end{array}$$ Some people consider having type AB blood to be an undesirable outcome because it may be difficult to find matching donors. What is the risk of having type AB?

A) 0.05
B) 0.95
C) 1.05
D) 20.0