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

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Manager
Joined: 30 Jul 2007
Posts: 129

Kudos [?]: 22 [0], given: 0

The probability that a visitor at the mall buys a pack of [#permalink]

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10 Sep 2008, 18:37
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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

Kudos [?]: 22 [0], given: 0

VP
Joined: 05 Jul 2008
Posts: 1402

Kudos [?]: 437 [0], given: 1

Re: m04 - probability candy [#permalink]

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10 Sep 2008, 18:44

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

Kudos [?]: 437 [0], given: 1

Manager
Joined: 30 Jul 2007
Posts: 129

Kudos [?]: 22 [0], given: 0

Re: m04 - probability candy [#permalink]

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10 Sep 2008, 18:50
icandy wrote:

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.

Kudos [?]: 22 [0], given: 0

Re: m04 - probability candy   [#permalink] 10 Sep 2008, 18:50
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