SOLUTION: A survey done for a magazine found that 77% of bike riders sometimes ride without a helmet. If four bike riders are randomly selected, find the probability that at least one of the

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Question 695227: A survey done for a magazine found that 77% of bike riders sometimes ride without a helmet. If four bike riders are randomly selected, find the probability that at least one of the riders does not wear a helmet at all times.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
A survey done for a magazine found that 77% of bike riders sometimes ride without a helmet. If four bike riders are randomly selected, find the probability that at least one of the riders does not wear a helmet at all times.
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Binomial Problem with n = 4 and p(helmet) = 0.77 ; p(no helmet) = 0.23
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P(x >=1 no helmet) = 1 - P(all wear helmets) = 1- 0.77^4 = 0.6485
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Cheers,
Stan H.
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