<PRE><B>Question 317048</B>
2. Thirty-eight percent of people in the United States have type O+ blood.
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a. If you randomly select five Americans and ask them if their blood type is O+, what is the probability that exactly 3 will have blood type O+?
(You MUST use the binominal formula)
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n = 5 ; p = 0.38
P(x=3) = 5C3*(0.38)^3*(0.62)^2 = 0.2109
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b. If 5 Americans are selected at random, find the probability that 1 or less Americans will have O+ blood type.
(You MUST use the binomial formula)
(x = 0 or 1) = 5C0(0.38)^0(0.62)^5 + 5C1(0.38)*(0.62)4 
= 0.3724
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Cheers,
Stan H.
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