SOLUTION: The probability that a person in the United States has type O+ blood is 83%. Three unrelated people in the United States are selected at random. Find the probability that a) all t

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Question 328096: The probability that a person in the United States has type O+ blood is 83%. Three unrelated people in the United States are selected at random. Find the probability that
a) all three have type O+ blood
b) none of the three has type O+ blood
c) at least one of the three has type O+ blood
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
a)P(all O+)=%280.83%29%280.83%29%280.83%29=0.572
.
.
b)P(none O+)=%280.17%29%280.17%29%280.17%29=0.00491
.
.
c)"At least 1 O+" is equivalent to "not none O+" (forgive the incorrect English).
P(not none O+)+P(none O+)=1
P(not none O+)=1-P(none O+)
P(not none O+)=1-0.00491
P(at least 1 O+)=0.995