SOLUTION: Approximately 70% 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 pl

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Question 729509: Approximately 70% 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.
Found 2 solutions by lynnlo, ikleyn:
Answer by lynnlo(4176) About Me  (Show Source):
Answer by ikleyn(53339) About Me  (Show Source):
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Approximately 70% 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.
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P[at least one type O] = 1 - P[no one type O] = 1 - %281-0.7%29%5E4 = 1 - 0.3%5E4 = 1 - 0.0081 = 0.9919.


This is an EXACT value - there is no need to round.


ANSWER.  P[at least one type O] = 0.9919.

Solved, with complete explanations.