Question

Human blood may contain either or both of two antigens,AandB. Blood that containsonly theAantigen is called typeA, blood that contains only theBantigen is called typeB, blood that contains both antigen is called typeAB, and blood that contains neitherantigen is called typeO. At a certain blood bank, 35% of the blood donors have typeAblood, 10% have typeB, and 5% have typeAB.(a) What is the probability that a randomly chosen blood donor is typeO

Answer 1

The probability of blood group O is P(O) = 0.50

Explanation:

P(A) = 35/100

P(B) = 10/100

P(AB) = 5/100

P(O) = ?

P(O) = 1 - ( P(A)+P(B) + P(AB))

= 1 - (35/100 + 10/100 + 5/100)

= 1 - 50/100

P(O) = 0.50