SOLUTION: In a certain high-risk group, the chances of a person having suffered a heart attack are 55%. If 6 people are chosen, find the probability that at least 1 will have had a heart att

Question 355015: In a certain high-risk group, the chances of a person having suffered a heart attack are 55%. If 6 people are chosen, find the probability that at least 1 will have had a heart attack.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
In a certain high-risk group, the chances of a person having suffered a heart attack are 55%. If 6 people are chosen, find the probability that at least 1 will have had a heart attack.
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Binomial Problem with n=6 and p= 0.55
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P(at least one) = 1 - P(none)
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P(at least one has a heart attack) = 1 - P(none of 6 has a heart attack)
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= 1 - 0.45^6
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= 1 - 0.0083
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= 0.9917
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cheers,
Stan H.
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