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:
?
?
$$\begin{array} { | l | l | l | l | l | }
\hline \text { Blood type } & \text { O } & \text { A } & \text { B } & \text { AB } \
\hline \text { Probability } & 0.50 & ? & 0.20 & 0.05 \
\hline
\end{array}$$ 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?

Question

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:
?
?
$$\begin{array} { | l | l | l | l | l | } 
\hline \text { Blood type } & \text { O } & \text { A } & \text { B } & \text { AB } \
\hline \text { Probability } & 0.50 & ? & 0.20 & 0.05 \
\hline
\end{array}$$ 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?

Quizplus · Accepted Answer

The probability of choosing an African American person at random and having blood type AB is 0.05, according to the given table. This means that the risk of having type AB is 0.05, which is the same as the probability. Therefore, the best choice is A.

All Human Blood Can Be Typed as Either O, A