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# In the United States, 43% of people wear a seat belt while

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Director
Joined: 05 Jan 2008
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In the United States, 43% of people wear a seat belt while [#permalink]  28 Jun 2008, 00:12
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50% (01:04) correct 50% (01:07) wrong based on 2 sessions
In the United States, 43% of people wear a seat belt while driving. If two people are chosen at random, what is the probability that both of them wear a seat belt?
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Director
Joined: 13 Nov 2003
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Re: PS: Probability-2 [#permalink]  28 Jun 2008, 01:17
Hi
Think we should use binominal formula. Think the ans is (43/100)^2
Director
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Re: PS: Probability-2 [#permalink]  28 Jun 2008, 10:19
scthakur wrote:
Why not (43/100)*(42/99)?

that would've work if the population of the US consisted of 100 people. The assumption here is that the population is large enough and taking one person out will not change probabilities (independence of events).
SVP
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Re: PS: Probability-2 [#permalink]  28 Jun 2008, 10:24
Thanks maratikus for clarification.
Re: PS: Probability-2   [#permalink] 28 Jun 2008, 10:24
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