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:

Blood type

O

A

B

AB

Probability

0.50

?

0.20

0.05

What is the probability that the person chosen has blood A?

0.04

0..25

0.27

Impossible to determine from the information given