Question 421078
The Better Business Bureau reported that approximately 72.2% of consumer complaints in 2006 were settled.
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If a random sample of five consumer complaints is selected,
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Binomial Problem with n = 5 
p(settled) = 0.722
p(not settled) = 0.278
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what is the probability that at least one was not settled? 
P(at least one was not settled) = 1 - P(all were settled of 7225)
= 1 - (0.722)^5
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= 1 - 0.1962
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= 0.8038
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Cheers,
Stan H.


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At least one was settled?
P(at least one settled) = 1 - P(none settled of 5)
= 1 - (0.278)^5
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= 1 - 0.001660
= 0.99834..