Question 316729: 38% of people in the US have type O+ blood.
1) If randomly selecting 5 Americans, ask them if their blood type is O+, what is the probability that exactly 3 will have blood type O+? (use binomial formula)
2) If 5 Americans are selected at random, find the probability that 1 or less Americans will have O+ blood type? (binomial formula)
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! 38% of people in the US have type O+ blood.
1) If randomly selecting 5 Americans, ask them if their blood type is O+, what is the probability that exactly 3 will have blood type O+? (use binomial formula)
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P(x=3) = 5C3(0.38)^3*(0.62)^2 = 0.2109
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2) If 5 Americans are selected at random, find the probability that 1 or less Americans will have O+ blood type? (binomial formula)
P(x = 0 or 1) = 5C0(0.38)^0*(0.62)^5 + 5C1(0.38)*(0.62)^4
= 0.2808 + 0.0916
= 0.3724
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Cheers,
Stan H.
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