<PRE><B>Question 729221</B>
Approximately 40% of the Wisconsin population have type O blood. If 4 persons are selected at random to be donors, find P[at least one type O]. Round your answer to four decimal places. 
P(at least 1) = 1 - P(none)
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= 1 - 0.6^4
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= 1 - 0.1296
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= 0.8704
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Cheers,
Stan H.
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