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The probability that a visitor at the mall buys a pack of

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Director
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The probability that a visitor at the mall buys a pack of [#permalink] New post 24 Nov 2007, 07:45
The probability that a visitor at the mall buys a pack of candy is 30%. If three visitors come to the mall today, what is the probability that exactly two will buy a pack of candy?

* 0.343
* 0.147
* 0.189
* 0.063
* 0.027

PLease explain ..
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Re: probability visitor [#permalink] New post 24 Nov 2007, 08:18
Amit05 wrote:
The probability that a visitor at the mall buys a pack of candy is 30%. If three visitors come to the mall today, what is the probability that exactly two will buy a pack of candy?

* 0.343
* 0.147
* 0.189
* 0.063
* 0.027

PLease explain ..


Answer is 0.189.

(3/10)(3/10)(7/10)*3C2

See this link:
http://www.gmatclub.com/forum/t55515
Re: probability visitor   [#permalink] 24 Nov 2007, 08:18
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The probability that a visitor at the mall buys a pack of

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