Question

All human blood is one of the four types: O,A,B,or AB. The distribution of the types varies a bit with race. If you choose an African American person at random, here is a table of the approximate probabilities of that person having each of the different blood types.

Blood Type O A B AB
Probabilty 0.5 ? 0.2 0.05

Using the table of probability above, the probability that the person chosen has blood type A is

0.05
0.25
0.27
0.40
0.65

Answer 1

sum of all probability = 1
0.5 + P(a) + 0.2 + 0.05 = 1
solve for P(a)

Answer 2

.65

Answer 3

try again

Answer 4

.25

Answer 5

correct

Answer 6

Thank you

Answer 7

you are welcome