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Statistics, probability help please ! 
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#1
Jul611, 12:43 PM

P: 30

1. The problem statement, all variables and given/known data
In a certain highrisk group, the chance of a person having suffered a heart attack is 70%. If four persons are chosen from the group, find the probability that at least one will have had a heart attack. 2. Relevant equations (work shown below) these would be dependent 3. The attempt at a solution (.7)/(4) = 2.8 


#2
Jul611, 12:51 PM

P: 926

It might be easier to think of the chance that a specific individual doesn't have a heart attack, so what are the chances that none of the individuals have heart attacks (and you might want to rethink the dependence).



#3
Jul611, 12:52 PM

P: 13

your answer is wrong
i don think it is a dependent event the probability of a person with heart attack is 0.7 so the probability that among 4 at least 1 has heart attack = 1  probability that none have = 1  (0.3)[itex]^{4}[/itex] must be correct but verify it 


#4
Jul611, 01:25 PM

P: 6

Statistics, probability help please !
Amateur's answer is correct.
Your attempt doesn't make any sense. Remember: probability can never be more than 1. So if you find 2.8, think again. 


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