Answer
a. $0.43$
b. $0.52$
c. $0.17$
Work Step by Step
a. Has type O blood
The probability of choosing one American and has type O blood is $p=0.43$
b. Has type A or B
The probability of choosing one American and has type A or B blood is $p=0.4+0.12=0.52$
c. Does not have type O or A
The probability of choosing one American and does not have type O or A blood is $p=0.12+0.05=0.17$