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

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Manager
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Joined: 30 Jul 2007
Posts: 130
The probability that a visitor at the mall buys a pack of  [#permalink]

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New post 10 Sep 2008, 18:37
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

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Re: m04 - probability candy  [#permalink]

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New post 10 Sep 2008, 18:44
Probability of buying is 3/10 Not buying is 7/10

So its 3/10 X 3/10 X 7/10

2 out of 3 can be picked in 3 C 2 ways

hence 3 X 3/10 X 3/10 X 7/10 = .189
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Re: m04 - probability candy  [#permalink]

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New post 10 Sep 2008, 18:50
icandy wrote:
Probability of buying is 3/10 Not buying is 7/10

So its 3/10 X 3/10 X 7/10

2 out of 3 can be picked in 3 C 2 ways

hence 3 X 3/10 X 3/10 X 7/10 = .189


Cool. Thanks. That is the OA.

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Re: m04 - probability candy &nbs [#permalink] 10 Sep 2008, 18:50
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The probability that a visitor at the mall buys a pack of

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